# Changelog

## [0.27.5] — 2026-03-11

### Summary

Team tasks — team members can view team-scoped tasks, team admins can
create and manage them. Settings and sidebar surfaces show team tasks
alongside personal tasks with team attribution badges.

### Added

#### Team Task Routes
- `GET /api/v1/teams/:teamId/tasks` — list team tasks (any team member).
- `POST /api/v1/teams/:teamId/tasks` — create team-scoped task (team admin).
- `PUT/DELETE/run/kill` on team-scoped task routes (team admin).

#### Access Control Helpers
- `canAccessTask()` — owner, system admin, or team member for team tasks.
- `canMutateTask()` — owner, system admin, or team admin for team tasks.
- Both used across Get, Update, Delete, ListRuns, RunNow, KillRun.

#### Frontend
- Settings Tasks section fetches team tasks via `/teams/mine` + per-team
  `/teams/:id/tasks`. Shows team badge on team-scoped tasks.
- Sidebar Tasks section includes active team tasks with `[TeamName]` label.

### Fixed
- `ListRuns` handler now checks task access (was unauthenticated — any
  user with a task ID could read run history).



## [0.27.4] — 2026-03-11

### Summary

Personal tasks — the user-facing task experience. Settings surface gains a
Tasks section with CRUD, schedule builder (presets + custom cron + timezone),
and 5 starter templates. Chat sidebar gains a Tasks section showing active
tasks with status indicators and run-now buttons. Executor gains note output
mode and BYOK provider enforcement.

### Added

#### Settings → Tasks Section (`task-settings.js`)
- **Task list** with name, schedule, timezone, last/next run, status badges.
  Pause/resume toggle, run-now, and delete buttons per task.
- **Create task form:** name, model, prompt editor, schedule builder (6
  presets + custom cron), timezone (defaults to browser), output mode
  (channel/note/webhook), budget overrides, notification toggles.
- **5 starter templates:** Morning News Digest, Daily Standup Prep, Weekly
  Project Summary, Stock Watchlist Check, Research Digest. Click to
  pre-populate the create form.

#### Tasks Sidebar Section (`task-sidebar.js`)
- New collapsible sidebar section (after Workflows/Queue).
- Shows active tasks with status indicators: ✓ (last run succeeded),
  ◷ (scheduled). Click opens the task's output channel.
- Per-task ▶ run-now button.
- Auto-refreshes on chat list update.

#### BYOK Provider Enforcement
- `tasks.personal_require_byok` global config key (default: false). When
  true, personal-scope tasks fail with a clear error if no BYOK provider
  is available — prevents fallthrough to org providers.
- Admin configuration UI in admin Tasks → Configuration tab.

#### Note Output Mode
- `output_mode: "note"` now functional. Task executor creates a note
  (title: "{task name} — {timestamp}", tags: ["task-output"]) instead of
  a message in the service channel. Good for structured reports.

### Changed
- `taskutil.TaskConfig` gains `PersonalRequireBYOK` field.
- `executor.go` persistence section rewritten as `output_mode` switch
  (channel/note/webhook).
- `task-admin.js` config tab gains "Require BYOK for Personal" toggle.
- `ui-core.js` `renderChatList` refreshes `TaskSidebar` alongside
  `WorkflowQueue`.
- `settings.html` gains Tasks nav link and panel mount point.
- `chat.html` includes `task-sidebar.js`.



## [0.27.3] — 2026-03-10

### Summary

Task chaining — webhooks for external integration, AI-spawnable sub-tasks,
and workflow-to-workflow completion triggers. Also fixes a bug where the
`workflow_advance` tool didn't fire `on_complete` chains.

### Added

#### Webhook Delivery (`server/webhook/`)
- **`webhook.Deliver(url, secret, payload)`** — POST with HMAC-SHA256 signing.
  3 retries with exponential backoff (1s, 5s, 25s), 10s timeout per attempt.
  `X-Switchboard-Signature` header for verification.
- **`webhook.GenerateSecret()`** — 32-byte hex random secret, auto-generated
  on task creation when `webhook_url` is set.
- **`webhook.Payload`** struct: task_id, task_name, workflow_id, channel_id,
  status, completed_at, output, stage_data, error.

#### Task Webhooks
- Task executor fires webhook on completion, failure, and budget breach.
  Runs in a goroutine — non-blocking.
- `webhook_secret` column on tasks table (migration 027).
- Secret auto-generated in task handler `Create` when `webhook_url` is provided.

#### Workflow Webhooks
- `webhook_url` and `webhook_secret` columns on workflows table (migration 027).
- Webhook delivered on workflow completion (both handler and tool paths).

#### `task_create` Tool
- AI-invocable tool that spawns sub-tasks from workflow/team contexts.
- **Predicates:** available in workflow channels and team channels only.
  Blocked in service channels (prevents recursive task spawning).
- **Scope inheritance:** created tasks inherit parent channel's team scope.
- **Depth limit:** service channel check prevents tasks creating tasks.
- Parameters: name, prompt, schedule (cron or "once"), persona, model,
  max_tokens, system_prompt. Validates cron before creation.

#### Workflow `on_complete` Chaining Extraction
- `TriggerWorkflowOnComplete()` extracted to `tools/workflow.go` as shared
  function. Used by both HTTP handler and `workflow_advance` tool.
- Handles both `on_complete` chain config and webhook delivery.

### Fixed
- **`workflow_advance` tool completion path** now triggers `on_complete`
  chaining. Previously only the HTTP `Advance` endpoint fired chains —
  AI-driven stage advancement silently skipped them.

### Changed
- `Workflow` model gains `WebhookURL`, `WebhookSecret` fields.
- `WorkflowPatch` gains `WebhookURL` field.
- `Task` model gains `WebhookSecret` field.
- `workflow_instances.go` `triggerOnComplete` method replaced with
  one-line delegation to shared `tools.TriggerWorkflowOnComplete()`.



## [0.27.2] — 2026-03-10

### Summary

Task execution — the scheduler can now actually run completions. Headless
executor wires tasks into the full completion pipeline (provider resolution,
tool execution, budget enforcement, notifications). Admin panel gains a Tasks
section for CRUD, run history, kill switch, and global task configuration.

### Added

#### Core Tool Loop Extraction
- **`CoreToolLoop` + `LoopSink` interface.** Single canonical implementation of
  multi-round LLM completion with tool execution. Replaces three duplicated
  implementations (SSE streaming, multi-model streaming, sync JSON). Budget
  enforcement built in: `MaxTokens`, `MaxToolCalls`, `MaxRounds`.
- **`LoopResult.BudgetExceeded`** field tracks which limit was hit. Callers
  get budget status without inspecting loop internals.
- **Four sink implementations:** `sseSink` (interactive SSE), `sseModelSink`
  (multi-model SSE), `accumSink` (sync JSON), `HeadlessSink` (scheduler).

#### Provider Resolution Extraction
- **`ResolveProviderConfig()`** standalone function. Resolution chain:
  explicit config → channel config → owner's personal → global. Shared by
  completion handler and task executor.
- **`BuildToolDefs()`** standalone function. Server-registered tools filtered
  by context predicates + browser extension tools + persona tool grant allowlist.
- **`FilterToolDefsByGrants()`** for task-level tool grant narrowing.

#### Task Executor (`scheduler/executor.go`)
- **Headless completion pipeline.** Resolves provider, builds messages + tools,
  runs `CoreToolLoop` with `Streaming: false`, persists assistant response in
  service channel, updates run record with tokens/tools/wall-clock, sends
  owner notification.
- **Budget enforcement.** `max_tokens`, `max_tool_calls` from task definition.
  Wall clock via `context.WithTimeout`. Budget breach → `budget_exceeded`
  status + mandatory owner notification.
- **Provider routing.** Task `provider_config_id` → channel → owner's
  personal BYOK → team → global. Full vault decryption path.
- **Tool grants.** Persona grants + task-level grants applied as second-pass
  allowlist. No browser tools in headless mode.

#### Task Configuration (`taskutil/`)
- **`LoadTaskConfig()`** reads from `global_settings` key `"tasks"`. Fields:
  `enabled`, `allow_personal`, `max_concurrent`, `default_max_tokens`,
  `default_max_tool_calls`, `default_max_wall_clock`.
- **`ApplyDefaults()`** fills zero-value budget fields on new tasks.
- **Full cron parsing** via `robfig/cron/v3`. Replaces hand-rolled
  `parseDailyCron`. Supports 5-field cron + descriptors (`@hourly`, `@daily`).
- **`ValidateCron()`** pre-create validation rejects invalid expressions.

#### Permissions + Global Config
- **`task.create`** permission — gates task create/update/delete/run routes.
- **`task.admin`** permission — for future admin-level task management.
- **Global config keys:** `tasks.enabled` (kill switch), `tasks.allow_personal`,
  `tasks.max_concurrent` (scheduler poll limit).

#### Admin Panel
- **Tasks section** under Workflows category. Two tabs: task list + configuration.
- **Task list:** all tasks across users with status, schedule, run count, next
  run time. Action buttons: run now, view history, delete.
- **Run history:** drill-down per task showing start/end times, tokens used,
  tool calls, wall clock, status badge, error messages.
- **Kill switch:** cancel active run from run history view.
- **Configuration tab:** toggle tasks enabled/personal, set max concurrent and
  default budget ceilings. Writes to `global_settings` key `"tasks"`.

#### Routes
- `POST /api/v1/tasks/:id/kill` — cancel active run (user + admin)
- `POST /api/v1/admin/tasks/:id/run` — admin trigger
- `POST /api/v1/admin/tasks/:id/kill` — admin kill
- `DELETE /api/v1/admin/tasks/:id` — admin delete

### Changed
- **`stream_loop.go`** rewritten from 559 lines to 181 — thin wrappers over
  `CoreToolLoop`. Identical behavior, zero duplication.
- **`completion.go`** `syncCompletion` rewritten as wrapper. `resolveConfig`
  and `buildToolDefs` delegate to standalone functions. `-237 lines`.
- **Scheduler startup** moved from early init to after hub + notification
  service initialization. Executor needs both.
- **`scheduler.New()`** signature: `New(stores) → New(stores, executor)`.
  Executor is optional (nil = v0.27.1 behavior).
- **Cron computation** in scheduler and task handler now uses `robfig/cron/v3`
  via `taskutil.NextRunFromSchedule`. Create and update validate schedule
  before persisting.

### Dependencies
- Added `github.com/robfig/cron/v3 v3.0.1`



# Changelog Additions — v0.26.0

## [0.26.0] — 2026-03-10

### Summary

Workflow engine — team-owned staged processes with AI intake, visitor-facing
branded entry, human assignment queue, and admin builder UI. Channels become
execution contexts that move through defined stages, driven by personas and
monitored by team members.

### Added

#### Workflow Definitions (v0.26.1)
- **Workflow CRUD.** `POST/GET/PATCH/DELETE /api/v1/workflows` with name, slug
  (auto-generated from name if omitted), description, entry_mode
  (`authenticated` | `public_link`), is_active flag, branding JSONB, retention
  JSONB. `UNIQUE(team_id, slug)` with partial index for global workflows.
- **Stage CRUD.** `POST/GET/PUT/DELETE /api/v1/workflows/:id/stages/:sid`.
  Stages have name, ordinal, persona_id, system_prompt, form_template (JSONB),
  history_mode (`full` | `summary` | `fresh`), assignment_team_id.
- **Stage reorder.** `PATCH /api/v1/workflows/:id/stages/reorder` — transactional
  ordinal update from ordered_ids array.
- **Publish + versioning.** `POST /api/v1/workflows/:id/publish` creates an
  immutable `workflow_versions` snapshot (stages + persona tool grants).
  `GET /api/v1/workflows/:id/versions/:version` retrieves any published version.
  Duplicate publish returns 409. Schema: `workflows`, `workflow_stages`,
  `workflow_versions` (migration 023).
- **Permission gating.** Workflow create/update/delete requires `workflow.create`
  permission (existing permission constant).

#### Workflow Instances + Stage Transitions (v0.26.2)
- **Start instance.** `POST /api/v1/workflows/:id/start` creates a workflow
  channel, pins the published version, binds stage 0 persona, sets
  allow_anonymous based on entry_mode. Returns channel_id + stage info.
- **Advance/reject/status.** `POST /channels/:id/workflow/advance` (with
  optional form data merge), `POST /channels/:id/workflow/reject` (with
  required reason → system message), `GET /channels/:id/workflow/status`.
- **Workflow columns on channels.** `workflow_id`, `workflow_version`,
  `current_stage`, `stage_data` (JSONB), `workflow_status` (enum:
  active/completed/stale/cancelled), `last_activity_at` (migration 024).
- **Staleness sweep.** Background goroutine (1h tick) marks active workflow
  instances as `stale` when `last_activity_at` exceeds `WORKFLOW_STALE_HOURS`
  (default: 72, env-configurable, 0 to disable).
- **Stage data merge.** Dialect-safe (Go-side JSON merge, no Postgres `||`
  operator). Data accumulated across stages in `stage_data` column.

#### Visitor Experience (v0.26.3)
- **Workflow landing page.** `GET /w/:id/:slug` — public surface with branded
  layout (accent color, logo URL, tagline from workflow branding JSONB),
  persona name/icon, "Start" button, session resume link.
- **Visitor start flow.** `POST /api/v1/workflow-entry/:scope/:slug` — creates
  channel + anonymous session, binds stage 0 persona, sets session cookie,
  returns redirect to `/w/:channelId` (existing chat surface).
- **DenyVisitor tool scoping.** Workspace, git, memory tools already use
  `DenyVisitor` predicate (shipped in v0.26.0 foundation).

#### AI Intake + Assignment Queue (v0.26.4)
- **`workflow_advance` tool.** AI-callable tool with `RequireWorkflow`
  predicate — only available inside workflow channels. Persona calls this when
  form data is collected. Triggers same transition as handler advance.
  Accepts `data` (JSON object) + `summary` (string for stage note title).
- **Form template injection.** Completion handler injects current stage's
  `form_template` as a system prompt when `channelType == "workflow"`. Tells
  the persona what fields to collect and when to call `workflow_advance`.
- **Stage notes.** `CreateWorkflowStageNote()` persists collected form data as
  channel-scoped notes (title: "Stage N: {summary}", content: JSON).
- **Assignment queue.** `workflow_assignments` table (migration 025): channel,
  stage, team, assigned_to, status (unassigned/claimed/completed), timestamps.
  Created automatically when advancing to a stage with `assignment_team_id`.
- **Assignment endpoints.** `GET /teams/:teamId/assignments` (team queue),
  `GET /workflow-assignments/mine` (user's claimed), `POST /workflow-assignments/:id/claim`
  (optimistic lock), `POST /workflow-assignments/:id/complete`.

#### Workflow Builder UI (v0.26.5)
- **Admin workflows section.** New "Workflows" category tab in admin surface.
  List view with name, slug, entry mode, active status, version. Detail view
  with editable fields, stage list, add/edit/delete stages, form template JSON
  editor, publish button, public URL display.
- **Queue sidebar section.** "Queue" section in chat sidebar (after Channels).
  Shows user's claimed assignments with badge count. Click to navigate to
  workflow channel. Complete button per assignment.
- **Workflow API methods.** `workflow-api.js` extends global API object with
  full workflow CRUD, stage management, publish, instance lifecycle, and
  assignment queue operations.
- **Workflow CSS.** Stage row styling (draggable, ordinal badges), queue
  sidebar items, team queue panel, admin badges.

#### Foundation (v0.26.0)
- **Session cleanup job.** Background goroutine deletes expired anonymous
  sessions with no messages. `SESSION_EXPIRY_DAYS` env var (default: 30).
- **ExecutionContext TeamID wiring.** `teamID` propagated through completion,
  stream_loop, and messages handlers into `ExecutionContext`.
- **Stale code cleanup.** Surface delete now removes static assets. Fixed
  stale pricing comment. Removed deprecated `AllDefinitionsFiltered()`.
- **`workflow.create` permission.** Already in permission constants.

### Fixed
- **Gin route wildcard panic.** `/w/:id` (chat) and `/w/:scope/:slug` (landing)
  used different param names at the same path depth — Gin panics on registration.
  Fixed: landing route uses `/w/:id/:slug` (same param name, disambiguated by
  depth). API visitor start moved to `/api/v1/workflow-entry/:scope/:slug`.
- **SQLite surface registry nil panic.** `SeedSurfaces()`, `IsSurfaceEnabled()`,
  and `EnabledSurfaceIDs()` dereferenced nil Surfaces store on SQLite (no
  migration 022). Added nil guards with graceful fallbacks.

### Migration Notes
- **DB wipe required.** Migrations 023-025 add new tables/columns. Fresh
  `chat_switchboard_dev` DB recommended for dev deployments.
- **New env vars:** `SESSION_EXPIRY_DAYS` (default 30), `WORKFLOW_STALE_HOURS`
  (default 72). Both optional.
- **Frontend files:** 3 new JS files (`workflow-api.js`, `workflow-admin.js`,
  `workflow-queue.js`), 1 new CSS file (`workflow.css`). Templates updated
  to include them.

### How to Create a Workflow

1. **Admin → Workflows** tab → "+ New" → enter name
2. **Edit** the workflow: set description, entry mode, toggle Active
3. **Add stages** with names, persona assignments, form templates (JSON),
   history mode
4. **Publish** to create an immutable version snapshot
5. **Share** the public URL (`/w/{scope}/{slug}`) for visitor intake, or
   start instances via API (`POST /workflows/:id/start`)

### Known Gaps (v0.27.0)
- Team-scoped workflow management UI (team admins can only see workflows via
  admin panel, not the team settings surface)
- Drag-and-drop stage reorder in builder UI
- `on_complete` workflow chaining (column exists, nullable, not wired)
- Workflow retention policies (column exists, not enforced)
- Stage persona auto-switch in chat UI (backend binds persona, frontend
  doesn't reflect stage transition yet)


## [0.25.4] — 2026-03-09

### Added
- **Admin settings export/import.** Export button downloads versioned JSON envelope (`_type`, `_version`, `_exported_at`, `_switchboard_version`, `settings`, `policies`). Import validates envelope, shows confirmation with key counts and metadata, writes each key via `adminUpdateSetting()`. Sensitive key warning on export.
- **Workspace rename/delete.** Workspace picker rows show ✏ rename and 🗑 delete buttons. `API.deleteWorkspace(id)` method added (backend `DELETE /workspaces/:id` already existed). Confirmation dialog warns about permanent file deletion.
- **Bulk model visibility.** Settings → Models page shows "X visible, Y hidden of Z total" with **Show All** / **Hide All** buttons.
- **Multi-provider live test failover.** `LIVE_PROVIDERS=venice,openrouter` env var. `tryCompletion()` walks providers until one responds 200. `setupAllProviders()` tolerates individual setup failures. CI no longer fails on transient upstream 503s.

### Fixed
- **Admin surface: 6 audit fixes.** Stray `>` in back button, dual-bind race on back button, hardcoded People nav flash, `closeAdmin()` ignores return URL, `openAdminSection()` pushes history, Storage section empty (missing `files.js` script).
- **Banner overlapping surface content.** Body changed to `display:flex;flex-direction:column;height:100vh`. Surface is `flex:1;min-height:0`. Banners get `flex-shrink:0`. Replaced fragile `calc(100vh - ...)` with proper flex distribution.
- **Scaling architecture.** `#surfaceInner` wrapper in `base.html` — generic scale target via `transform:scale()`. No surface-specific selectors. Banners stay unscaled. Extension surfaces get scaling for free.
- **Group permissions 500.** Postgres `UpdateBuilder.SetNull()` incremented `argIdx` without adding an arg — positional placeholders misaligned after first NULL column. SQLite version was already correct.
- **BYOK/Personas toggles not working.** Admin saves to policies store (`allow_user_byok`), settings loader read from `GlobalConfig` (`user_providers.enabled`). Two different stores, two different keys. Fixed to read from `Policies.GetAll()`.
- **Stale settings modal HTML.** 225 lines of orphaned modal body content from pre-surfaces migration rendered directly in chat page flow (General tab with `display:block` always visible below chat input). Removed along with old admin panel modal (~320 lines total).
- **Team admin modal transparent.** `class="modal-content modal-lg"` → `class="modal"`. Also fixed save-to-note modal in `notes.js`. Zero `modal-content` references remain project-wide.
- **Team admin modal layout.** Duplicate `display` property (`display:none;...;display:flex`) made content always visible. Moved flex to CSS class `.team-admin-content`.
- **Team persona create button missing.** Template lacked `settingsTeamAddPersonaBtn` button and `settingsTeamAddPersona` form container that JS expected.
- **Settings surface handler wiring.** `_initSettingsListeners()` early-returned on missing `settingsModel` (only on General section), killing all handlers below including BYOK provider form, model visibility, team admin add-member/provider/persona. Restructured: settings features under `data-surface` guard, team admin features unconditional with `?.`.
- **Settings surface missing `App.policies` and `App.models`.** On chat surface, `app.js` populates these. Settings surface called wrong API (`getSettings()` returns user prefs, not policies). Fixed to `getPublicSettings()` + `fetchModels()`.
- **Model Roles section empty.** Template had no `userRolesConfig` container for the roles section. `loadUserRoles()` early-returned on BYOK disabled or no personal providers with zero feedback. Added proper template section with notice text.
- **User settings NULL/null corruption.** `users.settings` column: SQL NULL → Postgres `COALESCE` fix. JSON `null` literal → `NULLIF(settings, 'null')` + `jsonb_typeof` guard. Prevents `null || {...} → [null, {...}]` array concatenation. Both `GetSettings` and `UpdateSettings` fixed for Postgres and SQLite.
- **`null.model_roles` crash.** Fresh users have NULL settings → `API.getSettings()` returned null → `settings.model_roles` threw. Added `|| {}` fallback on all callsites.
- **Project files 403 for admins.** `ListByProject`, `UploadToProject`, and `loadAndAuthorize` ownership checks had no admin bypass. Added `c.GetString("role") != "admin"` guard.

### Migration Notes
- **No new migrations.** All fixes are handler/template/JS changes.
- **Data fix required.** Users with corrupted settings (JSON array or null literal) need manual cleanup — see release notes.

## [0.25.3] — 2026-03-09

### Fixed
- **Theme system mode broken.** `Theme.set('system')` called `removeAttribute('data-theme')` → `:root` CSS hardcoded dark → system always showed dark. Now resolves OS preference via `matchMedia`, sets `data-theme` to resolved value, registers listener for OS changes.
- **Resize bar jump on click.** `onStart` now pins inline width/minWidth immediately after measuring via `getBoundingClientRect()`. Prevents snap-back during open-transition.
- **Debug modal no background/scroll.** `class="modal-content modal-lg"` → `class="modal modal-wide"`. Modal body restructured as flex column with proper overflow.
- **Settings/admin back button.** Stashes `document.referrer` in sessionStorage, nav links use `location.replace()`, back button reads stashed URL.
- **Profile save errors.** Wrong element ID (`settingsDisplayName` → `profileDisplayName`), wrong API routes (`/users/me` → `/profile`, `/auth/password` → `/profile/password`).
- **Profile data empty.** `getUserContext()` only populated ID and Role from JWT. Now fetches full user record.
- **Scale slider range.** `max="120"` → `max="175"`. Commit on mouse release, not live on input.

## [0.25.2] — 2026-03-09

### Added
- **Drag-resize utility.** `drag-resize.js` — single primitive for workspace handle and pane split handles. Full-viewport overlay prevents iframes/CM6 from swallowing mousemove. Touch support. Transitions killed during drag.

## [0.25.1] — 2026-03-09

### Fixed
- Minor surface integration fixes and CSS corrections from v0.25.0 deployment.

## [0.25.0] — 2026-03-08

### Added
- **Dynamic surfaces architecture.** Go template engine (`server/pages/`) with `base.html` shell, surface-specific templates, per-surface script/CSS blocks. Surface manifest registry with `SeedSurfaces()` for DB persistence.
- **Surface registry.** `surface_registry` table. Admin can enable/disable surfaces. Core surfaces: chat, admin, settings, editor, notes.
- **Component extraction.** UserMenu, ModelSelector, FileTree, CodeEditor, NoteEditor extracted as standalone components with Go template partials + JS hydration.
- **Pane container.** `pane-container.js` / `pane-container.css` — multi-pane layout with resizable splits. Used by editor surface.
- **Admin surface.** Full-page admin at `/admin/:section` replacing the old modal. Category tabs (People, AI, Routing, System, Monitoring), left nav, section-specific scaffolding via `admin-scaffold.js`.
- **Settings surface.** Full-page settings at `/settings/:section` replacing the old modal. Section-specific templates with server-rendered content areas.
- **Editor surface rebuild.** File tree pane + code editor pane + chat assist pane. Surface manifest declares three panes with resizable splits.
- **`base.html` template shell.** Banner → `#surface` → banner layout. Early theme flash prevention. Universal init block (`Theme.init()` + `UI.restoreAppearance()`). Common scripts: `app-state.js`, `api.js`, `events.js`, `ui-primitives.js`, `ui-core.js`.
- **Persona tool grants.** `renderPersonaForm()` gains tool grants section — "All tools" checkbox with categorized tool checklist. `loadToolList()` fetches from `/api/v1/tools`. `loadToolGrants()` reads persona-specific grants.
- **`window.__PAGE_DATA__`** injection from surface data loaders. `window.__USER__` from authenticated user context.

### Changed
- **Surface navigation.** `UI.openSettings()` and `UI.openAdmin()` navigate to full-page surfaces instead of opening modals.
- **CSS decomposition.** Monolithic `styles.css` split into: `variables.css`, `layout.css`, `primitives.css`, `modals.css`, `chat.css`, `panels.css`, `surfaces.css`, `splash.css`, `pane-container.css`, `chat-pane.css`, `user-menu.css`, `tool-grants.css`, `admin-surfaces.css`.

### Migration Notes
- **Migration 022:** `surface_registry` table (UUID PK, unique surface_id, is_enabled, is_core, created_at).
## [0.24.3] — 2026-03-07

### Added
- **Anonymous session participants.** Unauthenticated visitors can interact with workflow channels via ephemeral session identities. `session_participants` table stores channel-scoped session tokens with auto-generated display names ("Visitor #N"). Two entry paths: cookie-based (default, random token in `sb_session` cookie, 30-day expiry) and mTLS-based (cert fingerprint as stable session identity).
- **`AuthOrSession` middleware.** Tries JWT auth first (Authorization header + `sb_token` cookie), falls back to session cookie for workflow channels. Validates channel is `type=workflow` with `allow_anonymous=true` before creating a session. Sets `auth_type=session` in context with `session_id` and `channel_id`.
- **Session-scoped API routes.** `POST /api/v1/w/:id/completions`, `POST /api/v1/w/:id/messages`, `GET /api/v1/w/:id/messages` — all under `AuthOrSession`. Session participants can send messages and trigger completions within their bound channel only.
- **Workflow entry page.** `GET /w/:id` renders a standalone chat UI via Go template (`workflow.html`). Minimal layout: channel title/description header, message list, input box, session identity footer. No sidebar, no settings, no navigation — purpose-built for anonymous intake.
- **`SessionStore` interface.** `Create`, `GetByToken`, `GetByID`, `ListForChannel`, `CountForChannel`, `Delete`. Both Postgres and SQLite implementations.
- **`SessionParticipant` model.** `ID`, `SessionToken`, `ChannelID`, `DisplayName`, `Fingerprint`, `CreatedAt`. Added as channel participant with `participant_type=session`, `role=visitor`.
- **`channels.allow_anonymous` flag.** Boolean column (default false) gating session access. Middleware enforces: only `type=workflow` channels with `allow_anonymous=true` accept session auth.
- **Session-aware handlers.** `CreateMessage`, `ListMessages`, and `Complete` all check `isSessionAuth()` and enforce channel scope via `sessionCanAccessChannel()`. Session participants bypass user-level budget and model allowlist checks (they use the workflow channel's allocated resources). `Complete` falls back to URL param for `channel_id` on workflow API routes.
- **Handler helpers.** `isSessionAuth(c)` and `sessionCanAccessChannel(c, channelID)` in `handlers/channels.go` for consistent session identity checks.

### Migration Notes
- **Migration 021:** Creates `session_participants` table (UUID PK, unique session_token, FK to channels, display_name, fingerprint). Adds `allow_anonymous` boolean column to `channels`. Both Postgres and SQLite.
- **No new env vars.** mTLS session path reuses existing `AUTH_MODE` and `X-SSL-Client-Fingerprint` header.

### What Doesn't Ship
- Workflow definitions and stage transitions (v0.25.0)
- Session-to-user promotion ("create an account from your session")
- Session expiry and cleanup (future housekeeping job)

## [0.24.2] — 2026-03-07

### Added
- **Fine-grained permission system.** 12 permission constants using `domain.action` convention (`model.use`, `model.select_any`, `kb.read`, `kb.write`, `kb.create`, `channel.create`, `channel.invite`, `persona.create`, `persona.manage`, `workflow.create`, `admin.view`, `token.unlimited`). `AllPermissions` slice for UI rendering and validation.
- **Permission resolution.** `auth.ResolvePermissions()` computes effective permissions as the union of the Everyone group plus all explicitly assigned group memberships. Admin users bypass checks entirely.
- **`RequirePermission()` middleware.** Gin middleware with per-request permission caching — computed at most once regardless of how many permission gates are chained. `GetResolvedPermissions()` helper for conditional logic in handlers.
- **Permission-gated routes.** `POST /personas` requires `persona.create`. `PUT/DELETE /personas/:id` requires `persona.manage`. `POST /knowledge-bases` requires `kb.create`. `POST /knowledge-bases/:id/documents` requires `kb.write`. `POST /channels` requires `channel.create`. `POST /channels/:id/participants` requires `channel.invite`.
- **Token budgets.** Per-group daily and monthly token ceilings stored as BIGINT columns on groups. `auth.ResolveTokenBudget()` returns the most restrictive budget across all memberships. Pre-flight enforcement in the completion handler — queries `usage_log` for current period totals, returns 429 when exceeded. BYOK bypass: personal-scope providers skip budget checks entirely.
- **Model access control.** Per-group `allowed_models` JSONB column (NULL = unrestricted). `auth.ResolveModelAllowlist()` unions all group allowlists — any group with NULL means unrestricted. Enforced in both the completion handler (403 on disallowed model) and the model list endpoint (filters response so users only see permitted models).
- **Everyone group.** Implicit group with stable well-known ID (`00000000-...0001`), `source=system`, seeded in migration 020. All authenticated users receive its permissions without explicit membership. Editable in admin — replaces the previously planned `DefaultUserPerms` / `global_config` approach. `source=system` guard prevents deletion (returns 400 from the store layer).
- **Admin permissions endpoints.** `GET /api/v1/admin/permissions` returns all valid permission strings. `GET /api/v1/admin/users/:id/permissions` returns effective resolved permissions for a user.
- **Admin group permissions UI.** Group detail view expanded with three new sections: permission checklist (checkbox per permission with description), token budget fields (daily/monthly, empty = unlimited), and model allowlist multi-select (deduped by model_id, all-checked = unrestricted). Single save button sends all fields in one PUT.
- **API methods.** `adminListPermissions()`, `adminGetUserPermissions(userId)`.

### Fixed
- **OIDC group creation compile error.** `auth/oidc.go` line 412 passed `string` to `*string` field (`Group.CreatedBy`). Fixed to `&createdBy`.

### Migration Notes
- **Migration 020:** Adds `permissions` (JSONB, default `'[]'`), `token_budget_daily` (BIGINT), `token_budget_monthly` (BIGINT), `allowed_models` (JSONB) columns to `groups` table. Extends `groups.source` CHECK to include `system`. Drops `NOT NULL` on `created_by` (NULL for system-seeded groups). Seeds the Everyone group with `model.use`, `kb.read`, `channel.create` permissions.
- Both Postgres and SQLite migrations included.
- **No new env vars.**

## [0.24.1] — 2026-03-07

### Added
- **mTLS auth provider.** `server/auth/mtls.go` — authenticates via reverse proxy headers (`X-SSL-Client-DN`, `X-SSL-Client-Verify`, `X-SSL-Client-Fingerprint`). Parses RFC 2253 distinguished names, auto-provisions users from cert CN, uses fingerprint as stable external identity. Configurable via `MTLS_HEADER_DN`, `MTLS_HEADER_VERIFY`, `MTLS_DEFAULT_ROLE` env vars.
- **OIDC auth provider.** `server/auth/oidc.go` — OpenID Connect with authorization code flow. JWKS key caching with auto-refresh on rotation, RSA token validation, split-horizon issuer support (`OIDC_ISSUER_URL` for backend, `OIDC_EXTERNAL_ISSUER_URL` for browser). Claim extraction for `preferred_username`, `email`, `name`, `groups`, `realm_access.roles`. Role mapping via configurable `OIDC_ADMIN_ROLE`. Group sync: adds/removes OIDC-sourced group memberships on every login based on IdP groups claim.
- **OIDC login flow.** `GET /api/v1/auth/oidc/login` redirects to IdP. `GET /api/v1/auth/oidc/callback` exchanges code for tokens, validates, auto-provisions user, issues internal JWT, redirects to login page with base64-encoded token fragment. Login page JS picks up `#oidc_result=...`, saves to localStorage, redirects to app.
- **Login page SSO button.** Template adapts by `AUTH_MODE`: builtin shows username/password form, OIDC shows "Sign in with SSO" button, mTLS shows certificate prompt.
- **Keycloak integration test environment.** `docker-compose-keycloak.yml` extends base compose with Keycloak 26 + pre-configured realm. `ci/keycloak-realm.json` includes switchboard client, group mapper, two test users (alice/user, bob/admin), two groups (engineering, leads). One command: `docker compose -f docker-compose.yml -f docker-compose-keycloak.yml up`.
- **`QArgs()` dialect adapter.** Handles Postgres `$N` placeholder reuse for SQLite — expands args to match positional `?` placeholders. Wrapper functions `database.QueryRow()`, `database.Query()`, `database.Exec()` (+ Context variants) replace `database.DB.Query(database.Q(...))` pattern with automatic arg expansion.
- **`QArgs` unit tests.** 5 tests covering reused placeholders, no-reuse passthrough, ILIKE rewrite, high placeholder numbers, Postgres no-op.
- **Channel list regression test.** `TestIntegration_ChannelListWithTypeFilter` exercises `types=direct,group` query path that previously returned 500 on SQLite.

### Fixed
- **SQLite `_time_format` DSN parameter.** Removed `_time_format=2006-01-02T15:04:05Z` from `modernc.org/sqlite` connection string — this parameter is `mattn/go-sqlite3`-only and caused `database ping: unknown _time_format` on startup.
- **SQLite store wiring.** `main.go` store initialization now uses `sqliteStore.NewStores()` when `DB_DRIVER=sqlite` instead of always using `postgres.NewStores()`. Fixes nil pointer panic in health accumulator goroutine.
- **nginx resolver for localhost.** Changed `set $backend http://localhost:8080` to `http://127.0.0.1:8080` — IP literal doesn't require DNS resolution inside container.
- **nginx extension asset routing.** Changed `location /api/` to `location ^~ /api/` — prevents `location ~* \.(js)$` regex from intercepting `/api/v1/extensions/.../main.js` requests.
- **Channel list 500 on SQLite.** Count query uses `user_id = $1 OR ... participant_id = $1` — Postgres allows reusing `$1` but SQLite's `?` is positional. Fixed with `QArgs` arg expansion.
- **OIDC group sync FK constraint.** `findOrCreateOIDCGroup` now receives the provisioning user's ID as `created_by`, satisfying the `groups.created_by REFERENCES users(id)` foreign key.

### Migration Notes
- **Migration 019:** `oidc_auth_state` table (ephemeral OIDC flow state), `groups.source` column (`manual`/`oidc`).
- **New env vars:** 10 mTLS (`MTLS_*`) + 11 OIDC (`OIDC_*`) + `AUTH_MODE` extended to accept `mtls`/`oidc`.

## [0.24.0] — 2026-03-06

### Added
- **Auth provider abstraction.** New `server/auth/` package with `Provider` interface: `Authenticate()`, `Register()`, `SupportsRegistration()`, `Mode()`. Three modes defined: `builtin` (implemented), `mtls` (v0.24.1), `oidc` (v0.24.1). `AUTH_MODE` env var selects provider at startup. mTLS/OIDC fail-fast with clear error if selected before implementation lands.
- **Builtin provider.** `auth.BuiltinProvider` extracts login/register logic from `handlers/auth.go` into the `Provider` interface. Identical behavior to v0.23.2 — reads `{login, password}` from request body, validates bcrypt hash, returns user with plaintext password as `VaultHint` for UEK unlock.
- **User handles.** `handle` column on `users` table — unique, auto-generated from username via `models.HandleFromName()`. Used as the `@mention` identifier for human users. Editable. `UniqueHandle()` appends `-2`, `-3` suffixes on collision (same pattern as persona handles).
- **Auth source tracking.** `auth_source` column on `users` table (`builtin`/`mtls`/`oidc`). `external_id` column for IdP subject IDs or cert fingerprints. Composite unique index on `(auth_source, external_id)`.
- **`GetByHandle()`** and **`GetByExternalID()`** on `UserStore` interface — both Postgres and SQLite implementations.
- **Design document.** `docs/DESIGN-0.24.0.md` — full spec for v0.24.0–v0.24.3 (auth abstraction, mTLS/OIDC, permissions, anonymous sessions). All open questions resolved.

### Changed
- **Auth handler refactored.** `AuthHandler` now holds a `provider auth.Provider` field. `Login()` delegates to `provider.Authenticate()`, then handles vault unlock and JWT generation. `Register()` delegates to `provider.Register()`. `generateTokens()` response includes `handle` and `auth_source`.
- **`BootstrapAdmin()` / `SeedUsers()`** backfill `handle` for existing users on startup (idempotent — skipped if handle already set). New users created with `auth_source=builtin` and auto-generated handle.
- **@mention resolution uses handles.** `resolveMention()` steps 3–4 now query `LOWER(handle)` instead of `LOWER(username)`. Backend and frontend aligned.
- **User search includes handles.** `GET /api/v1/users/search` returns `handle` field and filters on handle alongside username and display_name.
- **Autocomplete matches on handle.** `channel-models.js` filters user candidates by handle, username, and display name. The `@mention` token inserted into the input is the user's handle (not username).
- **User store queries updated.** All `SELECT` statements in both Postgres and SQLite user stores include `auth_source`, `external_id`, `handle`. Unified `scanOneUser` helper in Postgres, `scanOne` in SQLite — eliminates per-method scan block duplication.
- **User list API.** `List()` response includes `auth_source` and `handle` for all users.

### Migration Notes
- **DB wipe required.** Migration 018 adds three columns to `users`. Existing users backfilled with `auth_source='builtin'` and handle derived from username.
- **New columns:** `users.auth_source`, `users.external_id`, `users.handle`.
- **New indexes:** `idx_users_handle` (unique), `idx_users_external_id` (unique composite, partial).

## [0.23.2] — 2026-03-06

### Added
- **Unified active conversation.** `App.activeConversation = { id, type }` replaces `App.currentChatId` and `App.currentChannelId`. All code paths (send, stream, model bar, session restore, sidebar highlight) keyed off `App.activeId`. `setActive(id, type)` method, `activeType` getter, `getActiveChat()` helper.
- **Group leader default response.** When a `type=group` channel receives a message without an @mention, the leader persona responds. Leader resolved from `persona_group_members WHERE is_leader` via channel participants.
- **`@all` fan-out.** `@all` in message content routes to every persona participant. Depth-1 only — responses from @all do not trigger further chains.
- **Human message attribution.** Messages from other human participants show their avatar and display name instead of "You". Persona attribution verified for loaded history in channel context.
- **Channel lifecycle.** Archive action via context menu (sets `is_archived`, `archived_at`). Delete gated by `channel_retention.mode` policy (`flexible` allows delete, `retain` forces archive-only). Admin purge with `purge_after_days` floor. Retention config keys in `global_config`.
- **Participant mutation guards.** DMs block removal below 2 human participants. Groups block removal of last persona (returns 400 with clear error).
- **Channel context banner.** Slim bar below chat header showing ai_mode, topic, and routing hints. Adapts by conversation type (DM: partner name + @mention hint; Group: leader/all routing; Channel: ai_mode + topic).
- **`NotifyUserMention` via WebSocket.** Replaced broken gin context interface cast with direct `hub.SendToUser()`. Delivers `user.mentioned` event with channel_id, from_user, content preview.
- **User mention notification toast.** `user.mentioned` WebSocket event handler shows toast with content preview and increments unread badge.

### Fixed
- **Channel persistence through refresh.** `loadChannels()` read `resp.channels` but `ListChannels` returns paginated response with `data` key. Channels vanished on reload.
- **Folder drag-and-drop.** Three compounding issues: `folderId` never mapped in `loadChats()`, folder groups had no drag handlers, no unfiled drop zone. All fixed.
- **DM creation 404.** Route didn't exist. Added `GET /api/v1/users/search?q=` endpoint. Rewrote DM creation UI from text input to lazy search modal.
- **Channel ⋯ menu inconsistency.** Replaced ✕ delete button with ⋯ hover button matching folder pattern.
- **Folder ⋯ button reflow.** `display:none/block` caused arrow shift on hover. Changed to `visibility:hidden/visible`.
- **Folder delete spill.** Now shows three-button modal: "Keep chats" / "Delete chats too" / Cancel.
- **Unread subquery dependency.** Query used `last_read_message_id` (migration 017) which may not exist. Rewrote to use `last_read_at` (migration 005).
- **Settings Models section.** Template section fell through to generic div. Added dedicated template section.
- **`u.avatar` → `u.avatar_url`** in `ListMessages` JOIN and `treepath/path.go` `resolveSenderInfo()`.

### Migration Notes
- **Migration 017:** `last_read_message_id` column on `channel_participants`.

## [0.23.1] — 2026-03-05

### Added
- **Conversation type taxonomy.** Five types: `direct` (1:1 AI chat), `dm` (human-to-human), `group` (multi-participant), `channel` (named persistent space), `workflow` (staged process, deferred). Channel type constraint extended.
- **`ai_mode` on channels.** `auto` (AI responds to every message), `mention_only` (AI silent unless @mentioned), `off` (AI disabled). Completion handler checks `ai_mode` before dispatching.
- **Three-section sidebar.** Projects → Channels → Chats. Each section independently collapsible with localStorage persistence. Channels sorted by last activity. Chats keep existing time-grouped behavior.
- **Folder system.** `chat_folders` table with full CRUD. Drag chats into/out of folders. Folder context menu: rename, delete. `folder_id` column on channels.
- **DM plumbing.** `resolveMention()` extended to resolve users (exact + prefix on username, self-mention blocked). User @mention skips AI, delivers notification. DM creation flow with user search.
- **Presence heartbeat.** `user_presence` table. `POST /presence/heartbeat` (30s upsert), `GET /presence?users=...` (90s threshold). Client heartbeat interval with visibility pause/resume. Presence WebSocket events.
- **Channel participant CRUD.** `channel_participants` handler: list, add, update role, remove. Auto-created on channel creation. DM participants auto-added from `req.Participants`.
- **Persona groups wired.** CRUD endpoints for `persona_groups` and `persona_group_members`. `is_leader` flag on members.
- **`topic` column** on channels for header display.
- **User search endpoint.** `GET /api/v1/users/search?q=` — returns id, username, display_name for active users (max 20, excludes caller).

### Changed
- **`CreateChannel` accepts `type` field** (default `direct`). `ListChannels` supports `?types=dm,channel` multi-filter.
- **Channel sidebar rendering.** `renderChannelsSection()` shows # for channels, person icon for DMs. Online dots from presence data. Unread badges.
- **Chat list filtering.** `renderChatList` excludes `type=channel` and `type=dm` — only direct/group chats appear in the Chats section.

### Migration Notes
- **Migration 016:** `ai_mode`, `topic` on channels. `user_presence` table. Channel type constraint extended to include `dm`, `channel`.

## [0.23.0] — 2026-03-05

### Added
- **@mention routing.** Type `@persona-handle` or `@model-id` in any chat to route the completion to a specific persona or model. Works in all chats — no roster or group setup required. Resolution order: persona handle (exact, then prefix) → model catalog (exact, then prefix). Backend `resolveMention()` does direct DB lookup against `personas.handle` and `model_catalog.model_id`.
- **Persona handles.** Every persona gets a unique `handle` field (e.g. `veronica-sharpe`) auto-generated from the name. Editable in the persona form. Stored in `personas.handle` with a unique index. Used as the @mention identifier — no spaces, no ambiguity.
- **@mention autocomplete.** Typing `@` in the chat input shows a filterable popup of all enabled models and personas with avatars, display names, `@handle` hints, and provider info. Works in any chat. Matches against handle, model ID, and display name. Arrow keys + Enter/Tab to select, Escape to dismiss.
- **@mention pill rendering.** @mentions in message content render as styled accent-colored pills. Handles and display names both highlighted. Skipped inside `<code>` and `<pre>` blocks.
- **AI-to-AI chaining.** When a persona response contains an @mention of another persona, a follow-up completion fires automatically. Delivered via WebSocket (`message.created` event). Chain depth capped at 5. Self-mention blocked. Uses the same `resolveMention()` as user @mentions.
- **Participant list injection.** System prompt includes a list of available @mentionable personas so LLMs know who they can invoke. Injected in `loadConversation()` after memory hints. Excludes the current persona (no self-mention). Empty when no other personas exist (zero overhead on 1:1 chats).
- **Context boundaries.** When switching personas via @mention, a system message is injected before the user's message telling the target persona to ignore previous personas' styles. When a non-persona model responds after persona messages exist in history, a boundary tells it to use its own natural style.
- **Provider proxy support.** `provider_configs` table gains `proxy_mode` (system/direct/custom) and `proxy_url` columns. Provider HTTP clients use `proxy_mode` to configure transport: `system` = env-based (`HTTP_PROXY`), `direct` = no proxy, `custom` = explicit URL. All four providers (Anthropic, OpenAI, OpenRouter, Venice) updated.
- **Persona groups schema.** `persona_groups` and `persona_group_members` tables added (migration 004). Structural foundation for saved roster templates — CRUD and FE not yet implemented.
- **Per-provider model preferences.** `user_model_settings` unique key widened to `(user_id, model_id, provider_config_id)`. Same model from different providers gets independent visibility toggles. Frontend uses composite keys throughout.
- **Channel participants.** `channel_participants` table with polymorphic `participant_type` (user/persona/session), `role` (owner/member/observer). CRUD endpoints: list, add, update role, remove. Auto-created on channel creation.
- **Persona avatar resolution.** Assistant messages resolve persona portraits through channel roster → participant data → App.models lookup. Streaming messages also resolve avatars.
- **Save message to note.** Per-message "Note" button (visible on hover) opens a modal to create a new note or append to an existing note from any message. Supports text selection — selected text is saved instead of full message.
- **Group chat creation.** "Group Chat" option in New Chat dropdown. Persona picker with handles, scope badges, and model info. Creates channel + adds persona participants.
- **Chat type indicators.** Sidebar shows 👥 for group chats, ⚙ for workflow channels.

### Changed
- **Channel models constraint.** `channel_models` unique constraint split into two partial indexes: raw models keyed on `(channel_id, model_id, provider_config_id) WHERE persona_id IS NULL`, persona entries keyed on `(channel_id, persona_id) WHERE persona_id IS NOT NULL`. Two personas on the same underlying model now get separate roster entries.
- **Channel models queries.** `GetModels` and `GetModelByID` in both Postgres and SQLite stores now JOIN `personas` table to carry handle data alongside display name and persona ID.
- **User message alignment.** User bubbles use `flex: initial` with `max-width: 85%` to shrink-wrap content and right-align within the centered 768px column.
- **Channel list loading.** `loadChats()` no longer filters by `type=direct` — all channel types (direct, group, workflow) load on refresh.
- **Autocomplete CSS.** Replaced legacy CSS variable names (`--bg-primary`, `--text-secondary`, etc.) with current theme variables (`--bg-surface`, `--bg-raised`, `--text-3`, etc.) across all `channel-models.css`.
- **Persona form.** Added @mention handle field with auto-generation from name, monospace styling, and edit-locks (manual edit stops auto-gen). Handle included in `getValues()`, `setValues()`, and `clearForm()`.
- **Model dropdown.** Persona entries show `@handle` hint next to display name in accent color monospace.
- **Completion chain.** Rewritten to use `resolveMention()` directly instead of roster-based mention parsing. No roster, participant list, or channel_models dependency. Same function for user→LLM and LLM→LLM routing.

### Fixed
- **Notes modal visibility.** `_showSaveToNoteModal` now creates overlay with `modal-overlay active` class (was missing `active`, modal was invisible).
- **Single @mention routing.** Single-target @mentions no longer reload conversation (which caused duplicate user messages that broke Anthropic's API). System prompt swapped in-place on existing messages array.

### Migration Notes
- **DB wipe required.** Migrations 003, 004, and 005 modified. No upgrade path from previous schema — drop and recreate dev DB.
- **New columns:** `personas.handle`, `provider_configs.proxy_mode`, `provider_configs.proxy_url`.
- **New tables:** `persona_groups`, `persona_group_members`, `channel_participants`.
- **New indexes:** `idx_personas_handle` (unique), `idx_channel_models_raw` (partial), `idx_channel_models_persona` (partial).

## [0.22.8] — 2026-03-04

### Changed
- **Naming cleanup: preset → persona.** Unified domain terminology across the entire codebase. Routes `/presets` → `/personas` (user, team, admin). JSON response keys, request fields, Go struct fields, handler names, JS functions, CSS classes, DOM IDs, template strings, display text — all consistently use "persona". File renamed: `presets.go` → `personas.go`. Dual JSON keys (`"personas"` + `"presets"`) collapsed to single `"personas"` key. Config key `user_presets` → `user_personas`. Banner color presets intentionally left as "presets" (different domain concept).
- **Naming cleanup: APIConfigID → ProviderConfigID.** All Go structs and JSON fields now use `provider_config_id` consistently.
- **Removed aliases.** `chat_id` field removed from completion handler. `/models` route alias removed (use `/models/enabled`).
- **Shared app-state.js.** Extracted `App` state object, `fetchModels()`, and `resolveCapabilities()` from chat-only `app.js` into new `app-state.js` loaded by `base.html` for all surfaces. Settings and admin surfaces now have access to `App` state for model dropdowns, settings, and user context.
- **Auth tokens loaded for all surfaces.** `API.loadTokens()` now runs in `base.html` inline script so settings, admin, editor, and notes surfaces can make authenticated API calls.
- **Script loading consolidated in base.html.** `ui-core.js` moved from per-surface loads to `base.html`. `ui-primitives-additions.js` (never loaded by any surface) now loaded in `base.html`. All surfaces get the complete shared stack: app-state → api → events → ui-primitives → ui-primitives-additions → ui-core → pages.

### Added
- **Settings surface functions.** `UI.loadGeneralSettings()` populates the general settings form (model dropdown, system prompt, temperature, max tokens, thinking toggle) with server data. `UI.saveAppearance()` persists theme, scale, and font size. `UI.loadTeamsSettings()` renders team membership on the settings teams tab.
- **Design documentation.** `docs/DESIGN-SURFACES.md` (four-layer surface architecture, extension hooks, trust model), `docs/ICD-API.md` (domain-organized API contract, 240 routes), `docs/ICD-AUDIT.md` (cross-reference audit with resolution status).

## [0.22.7] — 2026-03-03

### Added
- **Theme system.** New `theme.css` provides complete light/dark theming via CSS custom properties with `[data-theme]` attribute switching. Variables cover backgrounds, surfaces, text, accents, borders, shadows, and component-specific tokens. System preference auto-detection via `prefers-color-scheme` media query. Old variables (`--bg-primary`, `--text-primary`) bridged via fallback chains (`var(--bg, var(--bg-primary, #0e0e10))`) — zero breakage of existing CSS.
- **ChatPane component.** New `chat-pane.js` provides a mountable, self-contained chat pane factory replacing the hardcoded singleton pattern. `ChatPane.create(opts)` returns an instance with `renderMessages()`, `appendChunk()`, `finalizeStream()`, `appendTyping()`, `removeTyping()`, `scrollToBottom()`, `showWelcome()`, `clear()`, `getInputValue()`, `setInputValue()`, `focusInput()`, `destroy()`. Lookup via `ChatPane.get(id)`, `ChatPane.forChannel(channelId)`, `ChatPane.active()`. Each instance owns its own DOM elements and channel binding.
- **Chat pane template component.** New `components/chat-pane.html` Go template partial: `{{template "chat-pane" dict "ID" "main"}}` renders a complete chat scaffold with messages container, input bar, model selector, send button, and toolbar mount points. Used by editor surface assist pane.
- **Splash/login surface.** Login page rewritten from minimal form to split-panel splash layout: animated grid canvas on hero side, tabbed auth card (Login + Register) on right. Registration form includes avatar upload, display name, email. Powered by new `pages-splash.js` module with `Pages.initSplash()`, grid animation, and `POST /api/v1/auth/register` + `PUT /api/v1/users/me/avatar` integration.
- **UI primitives additions.** New `ui-primitives-additions.js` extends the shared primitive library: `Toast` (show/success/error/warning/info with auto-dismiss stacking), `renderBadge()` (6 color variants), `renderIcon()` (20+ SVG icon set), `renderIconBtn()` (icon button factory with active state), `Theme` (init/set/get/resolved/renderToggle with localStorage persistence), `showConfirmDialog()` (enhanced with variant/callbacks), `mountAvatarUpload()` (file input with preview).
- **Settings BYOK gate.** Settings surface nav now conditionally shows "My Providers", "Model Roles", and "Usage" tabs only when BYOK is enabled. Server-side gate via `{{if .Data.BYOKEnabled}}` reads `GlobalConfig` key `user_providers.enabled`. Includes BYOK status indicator in nav footer with UEK encryption notice.
- **Settings User Personas gate.** Settings surface conditionally shows "My Personas" tab when user-created personas are enabled. Server-side gate via `{{if .Data.UserPersonasEnabled}}` reads `GlobalConfig` key `user_presets.enabled`.
- **Settings Models tab.** New "Models" nav link in settings surface for user model visibility preferences.
- **Editor assist pane.** Editor surface now includes a `chat-pane` template component for the right-side assist pane with split handle, wired up via `ChatPane.create()` on DOM ready.

### Changed
- **`base.html` template.** Added `data-theme` attribute on `<html>` element for theme system. Google Fonts preconnect + DM Sans / JetBrains Mono stylesheet. `theme.css` loaded before `styles.css`. New shared script tags for `ui-primitives-additions.js` and `chat-pane.js` (available on all surfaces). Added `window.__SETTINGS__` global from `PageData.SurfaceSettings`.
- **`PageData` struct** (`pages.go`). New fields: `Theme` (string), `SurfaceSettings` (any, serialized to `__SETTINGS__`), `InstanceName`, `LogoURL`, `Tagline`, `RegistrationOpen`. `Render()` defaults `Theme` to `"dark"` when unset.
- **`RenderLogin()`** (`pages.go`). Now calls `loadBranding()` and `isRegistrationOpen()` to populate splash/login template fields from `GlobalConfig` keys `branding.*` and `registration.enabled`.
- **`SettingsPageData`** (`loaders.go`). Added `BYOKEnabled` and `UserPersonasEnabled` boolean fields. `settingsLoader()` reads from `GlobalConfig` keys `user_providers.enabled` and `user_presets.enabled`.
- **`settings.html` template.** Reorganized nav: base tabs (General, Appearance, Models, My Presets) always visible; BYOK section (My Providers, Model Roles, Usage) gated; User Personas gated; then Knowledge, Memory, Notifications, Teams. Added `my-personas` to dynamic section loaders.
- **`editor.html` template.** Added `chat-pane` component in right-side assist pane with split handle and `ChatPane.create()` initialization.

### New Files
- `src/css/theme.css` — 305 lines: CSS custom properties, shared components, surface layouts
- `src/js/chat-pane.js` — 162 lines: mountable chat pane factory
- `src/js/ui-primitives-additions.js` — 199 lines: Toast, Badge, Icons, Theme, confirm, avatar
- `src/js/pages-splash.js` — 154 lines: splash init, login, register, grid canvas
- `server/pages/templates/components/chat-pane.html` — 23 lines: reusable template partial

## [0.22.6] — 2026-03-03

### Fixed
- **Split FE/BE deployment: page route proxying.** Frontend container now supports `BACKEND_URL` env var. When set, the entrypoint generates nginx `proxy_pass` blocks for page routes (`/`, `/login`, `/chat/:id`, `/admin/*`, `/editor/*`, `/notes/*`, `/settings/*`) so Go template rendering works in k8s split-image deployments. When unset, behavior is unchanged (SPA fallback). Both `BASE_PATH=""` and `BASE_PATH="/prefix"` variants supported.
- **CI test timeout.** All `go test` commands now include `-timeout 8m` to prevent indefinite hangs from runner resource contention or race-detector compilation stalls. Previously used Go's 10-minute default with no goroutine dump on timeout.

### Removed
- **`router.js` (322 lines).** Client-side hash router fully replaced by server-side page routes. All `Router.*` call sites in `chat.js` replaced with `history.replaceState()` for URL updates. All `typeof Router` guards in `app.js` removed.
- **`surfaces.js` (368 lines).** Client-side surface registry replaced by Go template surface architecture. Extension API stubs (`surfaces.register`, `surfaces.activate`, etc.) now log deprecation warnings. `surfaces.getCurrent()` returns `window.__SURFACE__` from server-rendered page data.
- **`index.html` SPA shell (1,296 lines → 16 lines).** Original monolithic SPA entry point replaced with a minimal redirect page. All real routes now served by Go templates; `index.html` only serves as nginx `try_files` fallback for unknown paths.
- **`editor-mode.js` old Surfaces paths (~260 lines).** Removed `_register()`, `openDirect()`, `_unregister()`, `_activate()`, `_deactivate()`, `_embedChat()`, `_returnChat()`, and full `check()`/`checkStartup()` implementations. Only `mountServerRendered()` remains as the entry point. `check()` and `checkStartup()` kept as no-ops for backward compat with `projects-ui.js` callers.
- **SPA-only entrypoint code path.** `docker-entrypoint-fe.sh` now requires `BACKEND_URL` (fails fast if unset). Removed dead `%%BASE_HREF%%`, `%%ENVIRONMENT%%`, `%%BRANDING_JSON%%` injection into index.html. Removed branding config file loading (branding now handled by Go templates).

### Changed
- `docker-entrypoint-fe.sh`: Simplified from 227 → 184 lines. Requires `BACKEND_URL`. Removed SPA-only fallback path.
- `nginx.conf` (unified container): Consolidated repeated `proxy_set_header` blocks. Uses `$backend` variable. Page routes proxy to Go backend for template rendering.
- `base.html`: Added `__ENV__` and `__BRANDING__` globals for JS compatibility (previously injected by index.html sed).
- `server/pages/pages.go`: Added `Environment` field to `PageData`, populated from config.
- `extensions.js`: `ui.replace()`, `ui.restore()`, and `surfaces.*` API methods now log deprecation warnings instead of calling removed Surfaces system.
- `app.js`: Removed `Surfaces.init()`, `EditorMode.checkStartup()`, and `Router.init()` calls. Simplified to direct `sessionStorage` chat restore.
- `chat.js`: Replaced `Router.update()` calls with `history.replaceState()` for URL-bar sync on chat selection/creation.
- `repl.js`: Removed `surfaces.js` import reference.

## [0.22.5] — 2026-03-03

### Added
- **Go template engine.** Server-side HTML rendering via `html/template` with `//go:embed` for compiled-in templates. Custom `FuncMap` with helpers (`roleFilterType`, `toJSON`, `hasPrefix`, `dict`). CSP nonce generation per request. Replaces monolithic `index.html` + client-side DOM construction with composable, server-rendered surfaces.
- **Surface architecture.** Each page route renders a dedicated surface template that owns its full layout below the classification banner. Surfaces compose from reusable components (`model-select`, `team-select`, `file-upload`) without sharing CSS layout rules. Banner height handled via CSS custom properties (`--banner-top-h`, `--banner-bot-h`, `--surface-h`).
- **Chat surface.** Server-rendered shell at `/` and `/chat/:chatID`. Go template renders banner + layout + script tags; existing JS builds DOM inside the container. Bridge pattern preserves all current chat functionality.
- **Admin surface.** Full admin panel at `/admin/:section` with 5 category tabs (People, AI, Routing, System, Monitoring) and section sidebar. Server-rendered pages for providers, models, teams, users, and settings. Hybrid fallback for JS-loaded sections (groups, presets, knowledge, memory, health, capabilities, extensions, storage, usage, audit, stats).
- **Editor surface.** Server-rendered layout shell at `/editor/:wsId` with proper CSS height ownership. `mountServerRendered()` method on `EditorMode` bypasses the Surfaces registry for Go template mode. Dedicated CSS owns full viewport below banners — no layout collision with other surfaces. **(Fixes bugs #4, #5: editor layout collapse)**
- **Notes surface.** Server-rendered layout at `/notes/:noteId` with notes-main + notes-assist split. Boot script calls `openNotes()` in standalone mode. Responsive: assist pane hidden on mobile.
- **Settings surface.** Full-page settings at `/settings/:section` replacing modal-based settings. Left nav with all sections (general, appearance, providers, models, presets, roles, knowledge, memory, notifications, usage). General and Appearance sections server-rendered with form controls; dynamic sections populated by existing JS.
- **Login page.** Standalone Go template at `/login` with cookie-based auth. Sets `redirect_after_login` cookie for post-login navigation.
- **`AuthOrRedirect` middleware.** Cookie-based JWT validation for page routes. Reads `sb_token` cookie, redirects to `/login` on missing/invalid token (instead of 401 JSON). `RequireAdminPage()` helper aborts with 403 for non-admin users. Skips auth entirely in unmanaged mode.
- **Cookie-based auth sync.** `api.js` `saveTokens()` now sets `sb_token` cookie alongside localStorage on every token save/refresh. `clearTokens()` clears the cookie. Bridges API auth (Bearer header) with page auth (cookie).
- **Reusable `model-select` component.** Go template partial renders `<select>` with models filtered by type. Server passes filtered list; client-side cascade handler re-filters from `window.__PAGE_DATA__.models` on provider change. **(Fixes bug #1: admin model roles missing embedding models)**
- **Reusable `team-select` component.** Go template partial renders team dropdown with pre-populated options from server data loader. **(Fixes bug #2: routing policy team scope as text field)**
- **Reusable `file-upload` component.** Go template partial for drop zone + file picker. Used by editor surface.
- **Editor file upload.** Upload button in editor toolbar + drag-and-drop on file tree with visual feedback. `API.uploadWorkspaceFile()` sends File objects as raw body to existing `WriteFile` handler (binary-safe, respects workspace quota). Auto-opens single uploaded text files. **(Fixes bug #3: unable to upload files to a project)**
- **Page route data loaders.** Each surface registers a loader that pre-fetches exactly what its template needs: `chatLoader`, `adminLoader` (with section-specific data), `editorLoader`, `notesLoader`, `settingsLoader`. No over-fetching, no client-side fetch waterfall.
- **Admin provider CRUD.** Server-rendered provider table with add/edit form, type dropdown, sync button. Client-side handlers for create, update, delete, sync operations.
- **Admin model table.** Server-rendered catalog table with client-side search + type/provider filters.
- **Admin user management.** Server-rendered user table with search, role edit, enable/disable toggles.
- **Admin settings page.** Registration policy, permissions, banner config, and system prompt — all server-rendered with save handlers.
- **`pages.js` client handlers.** Role CRUD, routing policy CRUD, provider/model/team/user management, settings save — all working against existing API endpoints with proper token resolution.

### Changed
- `nginx.conf`: Added page route proxy blocks (`/`, `/login`, `/chat`, `/admin`, `/editor`, `/notes`, `/settings`) before SPA fallback. Static assets still served directly by nginx. Removed `/legacy` proxy block.
- `server/main.go`: Template engine init, `pages.SetVersion()`, route wiring for all surfaces with auth middleware groups. Removed `/legacy` fallback route.
- `src/js/api.js`: `saveTokens()` / `clearTokens()` sync `sb_token` cookie. New `uploadWorkspaceFile()` method for binary file upload to workspaces.
- `src/js/editor-mode.js`: Upload button + hidden file input in header. Drag-and-drop on file tree container with `.drag-over` visual state. `_uploadFiles()` method with text-file auto-open. `mountServerRendered()` for Go template boot path.
- `src/css/editor-mode.css`: `.drag-over` style for file tree drop target.

### Fixed
- **Bug #1**: Admin model roles now show embedding models. Server-side `roleFilterType()` sets `FilterType="embedding"` for the embedding role; `model-select` component filters by `model_type`.
- **Bug #2**: Routing policy team scope uses proper dropdown instead of free-text field. `adminLoader` pre-fetches team list; `team-select` component renders options.
- **Bug #3**: Editor file upload works. Upload button + drag-and-drop + `uploadWorkspaceFile()` API method.
- **Bug #4**: Editor chat assist pane is functional. Server-rendered layout with dedicated mount points.
- **Bug #5**: Editor and chat pane no longer squashed. Each surface owns its full viewport height via dedicated CSS — no shared flex container conflicts.

### Removed
- `/legacy` route and nginx proxy block. All page routes are now server-rendered.

## [0.22.4] — 2026-03-02

### Added
- **Rate limit tracking.** Provider health windows now track HTTP 429 / rate limit events separately from general errors. New `rate_limit_count` column on `provider_health` table. `RecordRateLimit()` method on health accumulator. Completion handler and stream loop classify `HTTP 429` / `rate limit` / `Too Many Requests` errors automatically.
- **Auto-disable policy.** Providers that report "down" status for N consecutive hourly windows are automatically deactivated. Configurable via `PROVIDER_AUTO_DISABLE_THRESHOLD` env var (default: 3, set to 0 to disable). `AutoDisabler` interface on health store, `checkAutoDisable()` runs on each flush cycle.
- **Tool health tracking.** Built-in tools (web_search, url_fetch, etc.) now record success/error/latency to `tool_health` table via the health accumulator. `RecordToolSuccess()` / `RecordToolError()` methods. Both tool execution sites in stream loop instrumented. `ToolHealthWindow` and `ToolHealthSummary` models.
- **Search provider health tracking.** web_search and url_fetch tool calls are now included in the tool health pipeline with per-invocation latency and error recording.
- **Project-specific file uploads.** `POST /api/v1/projects/:id/files` (multipart upload) and `GET /api/v1/projects/:id/files` (list). `project_id` column on `attachments` table. Files are stored under `projects/{id}/` prefix. Project access verified via ownership or team membership. Files queued for text extraction if enabled.
- **Workspace settings UI.** Git configuration section in project settings panel: remote URL, branch, credential selector. Appears when a workspace is bound. Saves via `PATCH /api/v1/workspaces/:id`. `updateWorkspace()` and `listGitCredentials()` API client methods.
- **PDF/DOCX export via pandoc.** New `POST /api/v1/export` endpoint converts markdown content to PDF or DOCX using pandoc. Editor export dropdown now includes "Export as PDF" and "Export as DOCX" options. Graceful error handling when pandoc is unavailable.
- **Project files UI.** File list and upload button in project settings panel. Shows file names and sizes. Multi-file upload support.
- **API client methods.** `projectUploadFile`, `projectListFiles`, `exportDocument`, `updateWorkspace`, `listGitCredentials`.

### Changed
- `health/accumulator.go`: Added `rateLimitCount` to bucket, `RecordRateLimit()`, `RecordToolSuccess()`, `RecordToolError()`, `flushTools()`, `checkAutoDisable()`, `SetAutoDisable()`, `AutoDisabler` interface, `toolBucket` struct. `Store` interface extended with `UpsertToolWindow()`, `ListAllToolCurrent()`.
- `handlers/completion.go`: `HealthRecorder` interface extended with `RecordRateLimit()`, `RecordToolSuccess()`, `RecordToolError()`. `recordHealth()` classifies HTTP 429 errors.
- `handlers/stream_loop.go`: Both tool execution sites now record tool health. `recordHealthFn()` classifies rate limit errors.
- `models/models.go`: `RateLimitCount` field on `ProviderHealthWindow`. `ToolHealthWindow`, `ToolHealthSummary` types. `ErrorCount`, `RateLimitCount`, `TimeoutCount` fields on `ProviderHealthSummary`. `ProjectID` field on `Attachment`.
- `store/postgres/health.go`: All queries updated for `rate_limit_count`. `UpsertToolWindow()`, `ListAllToolCurrent()`, `DeactivateProvider()` methods.
- `store/sqlite/health.go`: Full rewrite with rate_limit_count, tool health, and auto-disable support.
- `store/postgres/attachment.go`: `project_id` in cols, scan, create, and new `GetByProject()`.
- `store/sqlite/attachment.go`: Same project_id additions.
- `store/interfaces.go`: `GetByProject()` on `AttachmentStore`.
- `config/config.go`: `ProviderAutoDisableThreshold` field + env var loading.
- `main.go`: SQLite health store branching, auto-disable wiring, export handler route, project file routes.
- `handlers/health_admin.go`: Health summary includes error_count, rate_limit_count, timeout_count.
- `src/js/ui-admin.js`: Health dashboard cards show "Rate Limits" count with warning color.
- `src/js/projects-ui.js`: Git settings section, project files section, file upload handler.
- `src/js/editor-mode.js`: PDF and DOCX export menu items and handler.
- `src/js/api.js`: 5 new API client methods.

### Database
- Migration 015 (Postgres) / 014 (SQLite): `rate_limit_count` column on `provider_health`, `tool_health` table, `project_id` column on `attachments`.

## [0.22.3] — 2026-03-02

### Added
- **Provider admin UI: "Routing" category.** New admin category with three sections: Health, Routing, and Capabilities. Accessible from admin panel sidebar navigation.
- **Health dashboard.** Admin section showing per-provider status badges, request counts, error rates, average/max latency, timeout counts, and last error messages. Refresh button for live updates. CSS grid layout with responsive cards.
- **Routing policy builder.** Full CRUD UI for routing policies: create/edit form with name, priority, type (provider_prefer/team_route/cost_limit/model_alias), scope (global/team), team ID, JSON config editor, active toggle. List view with edit/enable/disable/delete actions.
- **Routing dry-run test panel.** Input model + user ID, evaluates against all active policies with live health status, displays ranked candidates with status badges and selection reasoning.
- **Capability override viewer.** Table listing all model capability overrides with model ID, provider config, field, value, and delete button. Explains auto-detection fallback when no overrides exist.
- **`provider_status` on models/enabled response.** `GET /api/v1/models/enabled` now includes `provider_status` field ("healthy"/"degraded"/"down"/"unknown") per model from live health data.
- **`ModelHandler` with health enrichment.** Extracted model listing into dedicated `handlers/capabilities.go` with `SetHealthStore()` for health status injection. Builds health map from current hourly windows.
- **`GET /api/v1/admin/capability-overrides` endpoint.** Returns all capability overrides across all models (admin view).
- **API client methods.** `adminGetAllProviderHealth`, `adminListRoutingPolicies`, `adminGetRoutingPolicy`, `adminCreateRoutingPolicy`, `adminUpdateRoutingPolicy`, `adminDeleteRoutingPolicy`, `adminTestRouting`, `adminListCapabilityOverrides`, `adminDeleteModelCapability`.

### Changed
- `src/js/ui-admin.js`: New "routing" admin category with health/routing/capabilities sections. `ADMIN_SECTIONS`, `ADMIN_LABELS`, `ADMIN_LOADERS` updated. Added `loadAdminHealth()`, `loadAdminRouting()`, `loadAdminCapabilities()`, `_showRoutingForm()`, `_toggleRoutingPolicy()`, `_deleteRoutingPolicy()`, `_runRoutingTest()`, `_deleteCapOverride()`.
- `src/js/api.js`: 9 new API client methods for health, routing, and capability admin endpoints.
- `src/index.html`: New admin category button for "Routing". Three new `admin-section-content` divs: `adminHealthTab`, `adminRoutingTab`, `adminCapabilitiesTab`.
- `src/css/styles.css`: `.admin-health-grid` and `.admin-health-card` styles.
- `models/models.go`: `ProviderStatus` field on `UserModel` struct.
- `handlers/capabilities.go`: Extracted `ModelHandler` from inline handlers. `ListEnabledModels` enriches response with provider health status. `ResolveModelCaps` canonical capability resolver.
- `main.go`: `ModelHandler` created with `SetHealthStore()` wiring. Capability override admin routes registered.

## [0.22.2] — 2026-03-02

### Added
- **Routing policy engine.** Rules-based request routing evaluated between "what model was requested" and "which provider serves it." `routing/` package with evaluator, fallback runner, and type-safe policy model.
  - **`provider_prefer`**: Ordered list of preferred provider configs — fallback to others if preferred are unavailable.
  - **`team_route`**: Restrict a team to only use specific provider configs (team-scoped access control).
  - **`cost_limit`**: Filter out providers above a heuristic cost threshold per request.
  - **`model_alias`**: Map alias names ("fast", "smart") to specific provider+model pairs.
- **Health-aware routing.** Candidates sorted by health status (healthy > degraded > unknown > down). `skip_down` flag removes down providers from consideration when healthy alternatives exist. All-down graceful degradation: keeps candidates rather than returning empty.
- **Fallback runner.** `routing.RunWithFallback()` tries candidates in order with configurable retry depth. Logs each failure and tries the next candidate. Returns the winning candidate and updated decision with fallback depth.
- **`routing_policies` table.** New migration (Postgres 014, SQLite 013) with scope (global/team), priority ordering, JSONB config, and active flag. Index on `(is_active, priority)` for efficient policy loading.
- **Routing policy admin CRUD.** Full REST API for policy management:
  - `GET /api/v1/admin/routing/policies` — list all policies
  - `GET /api/v1/admin/routing/policies/:id` — get single policy
  - `POST /api/v1/admin/routing/policies` — create policy (validates type, scope, team_id)
  - `PUT /api/v1/admin/routing/policies/:id` — update policy
  - `DELETE /api/v1/admin/routing/policies/:id` — delete policy
- **Dry-run routing test.** `POST /api/v1/admin/routing/test` accepts model + user_id + team_ids, evaluates active policies against all global provider configs with live health status, returns ranked candidates and the routing decision.
- **`X-Switchboard-Provider` response header.** Every completion response includes `providerID/configID` for routing observability.
- **`routing_decision` column on `usage_log`.** JSONB field for recording which policy matched, fallback depth, and total candidates evaluated.
- **`RoutingPolicyStore` interface** with Postgres and SQLite implementations. Supports Create, Update, Delete, GetByID, ListActive, ListAll, ListForTeam.
- **12 evaluator tests.** Coverage: no policies, provider_prefer ordering, team_route filtering (including wrong-team no-op), model_alias rewrite, health skip-down, health sorting, all-down graceful degradation, priority ordering, empty candidates, inactive policy skip.

### Changed
- `models/models.go`: Added `RoutingPolicy` struct and `RoutingDecision` field on `UsageEntry`.
- `store/interfaces.go`: Added `RoutingPolicyStore` interface and `RoutingPolicies` field on `Stores`.
- `store/postgres/stores.go`, `store/sqlite/stores.go`: Wired `RoutingPolicyStore` into factory.
- `handlers/completion.go`: Added `router`, `healthStore` fields. `HealthStatusQuerier` interface. `evaluateRouting()` method builds candidates from accessible configs, queries health status, runs evaluator, reloads credentials on config switch. `X-Switchboard-Provider`, `X-Switchboard-Route`, `X-Switchboard-Fallback` response headers.
- `main.go`: Creates `routing.Evaluator`, wires into completion handler via `SetRoutingEvaluator()` and `SetHealthStore()`. Registers 6 admin routing routes.

### Database
- Postgres: `server/database/migrations/014_v0222_routing.sql`
- SQLite: `server/database/migrations/sqlite/013_v0222_routing.sql`

## [0.22.1] — 2026-03-02

### Added
- **Provider profile schemas.** Each provider type declares its configurable settings with types, defaults, validation constraints, and dependency rules. Built-in schemas for openai, anthropic, venice, openrouter. Unknown types fall back to the openai schema. `providers/profile.go`.
- **Provider hooks (pre-request / post-stream).** Declarative request/response transforms driven by `provider_configs.settings` JSONB. Replaces any need for hardcoded provider switch statements in the completion path. `providers/hooks.go`.
  - **OpenAI:** `system_prompt_prefix`, `frequency_penalty`, `presence_penalty` → injected into ExtraBody.
  - **Anthropic:** `extended_thinking` + `thinking_budget` → injects `thinking` config into wire JSON, sets `anthropic-beta` header, clears temperature.
  - **Venice:** `enable_thinking`, `enable_web_search`, `include_venice_system_prompt` → builds `venice_parameters` in ExtraBody.
  - **OpenRouter:** `route`, `require_parameters` → serialized into `X-Provider-Preferences` header.
- **`ExtraBody` on `CompletionRequest`.** Provider hooks write arbitrary key-value pairs that get merged into the wire-format JSON via `mergeExtraBody()` in both OpenAI and Anthropic `doRequest` methods. Keeps the canonical request type clean while supporting provider-specific extensions.
- **Anthropic extended thinking stream support.** `content_block_delta` with `type=thinking_delta` now routes to the `Reasoning` field on `StreamEvent`, matching the existing `reasoning_content` path used by OpenAI-compatible providers.
- **Provider type registry.** `providers.RegisterType()` combines provider implementation + metadata (name, description, default endpoint, profile schema). `providers.ListTypes()` returns all registered types.
- **`GET /api/v1/admin/provider-types` endpoint.** Returns metadata and profile schemas for all registered provider types. Used by admin UI to render provider creation forms and show available settings per type.
- **Preset setting overrides.** `MergePresetSettings()` merges persona-level overrides onto provider-level settings, respecting `ProviderOnly` fields that cannot be changed at the preset level.
- **Comprehensive tests.** `providers/hooks_test.go`: 17 tests covering all four hook implementations, profile schemas, GetHooks, MergePresetSettings, mergeExtraBody, nil safety.

### Changed
- `providers/registry.go`: `Init()` now uses `RegisterType()` with full metadata instead of bare `Register()`. `ProviderTypeMeta` struct with ID, name, description, default endpoint, profile schema.
- `providers/provider.go`: `CompletionRequest.ExtraBody` field (json:"-"). `mergeExtraBody()` helper function. `Model` struct unchanged.
- `providers/openai.go`: `doRequest()` merges ExtraBody into wire JSON before HTTP dispatch.
- `providers/anthropic.go`: `doRequest()` merges ExtraBody + sets `anthropic-beta` header when thinking is enabled. Stream processing handles `thinking_delta` content block deltas. Wire type gains `Thinking` field.
- `handlers/completion.go`: `PreRequest` hook invoked at all three dispatch paths (multi-model, streaming, sync).
- `handlers/stream_loop.go`: `PostStreamEvent` hook invoked after each streaming event in both `streamWithToolLoop` and `streamModelResponse`.
- `handlers/health_admin.go`: Added `GetProviderTypes` handler.
- `main.go`: `GET /api/v1/admin/provider-types` route registered.

## [0.22.0] — 2026-03-02

### Added
- **Provider health tracking.** In-memory accumulator records success/error/timeout per provider config, flushes hourly buckets to `provider_health` table every 60s. Status derivation: healthy (<5% errors), degraded (5–25%), down (>25%). Background prune removes data older than 7 days.
- **Health admin endpoints.** `GET /api/v1/admin/providers/:id/health` returns per-provider summary + hourly windows. `GET /api/v1/admin/providers/health` returns current-hour status for all providers.
- **Capability admin overrides.** `capability_overrides` table supports per-provider or global overrides for any model capability field. Three-tier resolution chain: catalog → heuristic → admin override (highest priority).
- **Capability override endpoints.** `GET /api/v1/admin/models/:id/capabilities` with source annotations (catalog/heuristic/override). `PUT` to set, `DELETE` to remove, `GET /api/v1/admin/capability-overrides` to list all.
- **Workspace pane layout.** Frontend architecture replaces `.chat-area` + `.side-panel` with `.workspace` flex container. Primary and secondary panes are independent with drag-resize handle between them. Surfaces declare layout preferences via `primary`, `secondary`, `secondaryOpts` fields.

### Fixed
- **`scanJSON` driver buffer aliasing** (v0.21.7 bugfix). `safe_json.go` now copies the `[]byte` from the database driver instead of aliasing the slice header. Fixes intermittent `invalid character` errors on multi-row JSON responses caused by driver buffer reuse between `rows.Next()` calls.
- **`CreateChannel` RETURNING path** now uses `scanJSON(&ch.Settings)` instead of bare `&ch.Settings` scan.
- **`UpdateChannel` settings validation** — `json.Valid()` check before JSONB merge, returns 400 on invalid JSON instead of storing corrupt data.

### Changed
- `capabilities/intrinsic.go`: `ResolveIntrinsic()` takes `[]models.CapabilityOverride` as third parameter. `applyOverrides()` flips bool fields and sets int fields.
- `handlers/completion.go`: `HealthRecorder` interface, `recordHealth()` called after every `ChatCompletion` call.
- `handlers/stream_loop.go`: `streamWithToolLoop` and `streamModelResponse` accept `configID` + `HealthRecorder` params. Health recorded on error, timeout, and success paths.
- `store/interfaces.go`: `CapOverrides CapabilityOverrideStore` added to `Stores` struct.
- `models/models.go`: `ProviderStatus`, `ProviderHealthWindow`, `ProviderHealthSummary`, `CapabilityOverride` types.
- `main.go`: Health accumulator lifecycle (start/stop/prune), admin route registration, startup log includes health status.
- `panels.js`: Simplified to single `_active` panel in workspace secondary pane. Removed `_dualMode`, `_splitRatio`, `_secondary`.
- `surfaces.js`: Layout declarations (`primary`, `secondary`, `secondaryOpts`) in surface registration.
- `editor-mode.js`: Layout declarations for editor surface.
- `index.html`: Workspace container structure, removed dual-view split button.
- `styles.css`: Workspace pane CSS grid, handle, responsive rules.
- `app.js`: `_initWorkspaceResize()` replaces `_initSidePanelResize()` + `_initDualDivider()`.
- `ui-settings.js`: Zoom selector targets updated class names.

### Database
- Migration 013 (Postgres) / 012 (SQLite): `provider_health` table (hourly bucketed metrics), `capability_overrides` table (admin corrections).

## [0.21.6] — 2026-03-01

### Added
- **Editor surface: document features merged in.** Article mode (outline, export, word count, focus mode) folded into the single Editor surface rather than shipping as a separate surface. One surface, two concerns: code files get tabs + tree, text files get word count + export. Chat panel on the right with show/hide toggle.
- **New file button** — Visible in both the file tree header (+ icon) and the editor toolbar ("+ New"). Creates files with smart defaults (markdown files get `# Title` scaffold).
- **Export dropdown** — Download file, Export as HTML (via marked.js + DOMPurify), Copy to clipboard. Available from editor toolbar for any open file.
- **Chat panel toggle** — Show/hide the right-side AI chat pane. Editor left pane expands to fill when chat is hidden. Toggle button in toolbar with active state indicator.
- **Word count + reading time** in status bar for text files (markdown, txt, rst, adoc). ~230 wpm calculation.
- **Save indicator** in status bar — shows "● Modified" with warning color for unsaved files.
- **Git status indicators in editor file tree** (closing v0.21.5 deferred) — Tree rows show M/A/U badges with color coding (modified=yellow, added=green, untracked=italic gray, deleted=red strikethrough).
- **Auto-save on tab/mode switch in editor surface** (closing v0.21.5 deferred) — Modified files auto-save when switching tabs or deactivating the editor surface.
- **Ctrl+Shift+F workspace search** (closing v0.21.5 deferred) — Maps to Quick Open file finder.
- **`SEED_PROVIDERS` env var** — Auto-creates global providers on startup from CSV format `provider:api_key[:name]`. Supports openai, anthropic, openrouter, venice, mistral, groq, together, fireworks, deepseek, perplexity with auto-filled endpoints. Idempotent. Blocked in production.
- **Mode selector labels** — Surface buttons in sidebar show icon + label text ("Chat", "Editor"). Labels hide when sidebar collapsed.
- **Hash Router (`router.js`)** — URL-driven direct-to-surface navigation:
  - `#/chat` → default chat view
  - `#/chat/ch_abc123` → open specific chat (bookmarkable)
  - `#/editor` → editor surface (auto-picks workspace from project, or shows picker)
  - `#/editor/ws_abc123` → editor with specific workspace
  Browser back/forward works. Replaces `sessionStorage` chat restore. Workspace picker overlay when navigating without a workspace. Auto-selects if only one exists.
- **`openDirect(wsId)`** method on EditorMode — bypasses `check()` flow, registers surface directly with a given workspace ID. Used by Router for hash-based navigation.

### Fixed
- **`chat.switched` / `chat.created` events never emitted** — `selectChat()`, `newChat()`, and `sendMessage()` now emit these events. This was blocking EditorMode from detecting workspace bindings on channel switch.
- **`workspace_id` missing from channel responses** — Added to all SELECT/RETURNING/Scan paths for both SQLite and Postgres. Frontend chat objects now include `workspace_id`.
- **EditorMode.check() optimization** — Checks local `App.chats` data before API calls.
- **`defaultEndpoints` redeclared** — Renamed to `seedDefaultEndpoints` in `seed_providers.go` to avoid collision with `live_provider_test.go`.

### Removed
- **Article surface (`article-mode.js`, `article-mode.css`)** — Merged into Editor. Document features (export, word count, focus mode) are now part of the unified Editor surface. Article-specific AI tools (suggest_outline, expand_section) deferred to v0.22+ as editor extensions.

### Changed
- `editor-mode.js`: Rebuilt header with New/Export/ChatToggle buttons. File tree has header with + button. Chat panel show/hide. Word count + save indicator in status bar. `_createNewFile()`, `_exportActiveFile()`, `_toggleChat()` methods. `openDirect()` for Router.
- `editor-mode.css`: Header labels, export dropdown, chat toggle, file tree header, save indicator, word count styles.
- `chat.js`: Event emissions, `workspace_id` in chat objects, hash sync via `Router.update()`.
- `app.js`: Router initialization replaces sessionStorage restore.
- `projects-ui.js`: Project list mapping includes `workspace_id`.
- `channels.go`: `workspace_id` in all query/scan paths.
- `surfaces.js`: Updated comment (removed article reference).
- `styles.css`: Mode selector layout, router picker overlay.
- `index.html`: Removed `article-mode.css`/`article-mode.js`, added `router.js`.
- `config.go`: `SeedProviders` field.
- `main.go`: `SeedProviders()` call.
- `seed_providers.go`: `seedDefaultEndpoints` (renamed from `defaultEndpoints`).
- `ROADMAP.md`: Article→Editor merge documented. Go template pages added under v0.25.0.

## [0.21.5] — 2026-03-01

### Added
- **Editor Surface (Development Mode).** IDE-like experience built as a v0.21.3 surface consuming workspace primitives. Activates automatically when a channel or project has a bound workspace. Three-pane layout: file tree (sidebar), code editor (CM6), and AI chat panel with resizable split.
- **`editor-mode.js`** — Full editor surface module. File tree backed by `workspace_ls` API with nested directory expansion, file icons by extension, and context menus. Tab bar with modified indicators, close buttons, and multi-file editing. CM6 integration with language auto-detection (20+ languages) and textarea fallback when CM6 bundle unavailable.
- **Split pane layout** with draggable resize handle. Editor (left) and AI chat (right) share the main region. Chat DOM borrowed from Surfaces saved fragments — real conversation history and input preserved across mode switches.
- **Quick Open** (`Ctrl/Cmd+P`): Fuzzy file finder overlay using workspace file index. `Ctrl/Cmd+S` save, `Ctrl/Cmd+W` close tab.
- **Live editor updates**: When AI tool calls modify workspace files (`workspace_write`, `workspace_patch`), the server emits `workspace.file.changed` via WebSocket. If the file is open and unmodified in the editor, content refreshes automatically.
- **Status bar**: Current file path, language mode, git branch display.
- **`editor-mode.css`**: Complete styling for all editor components with dark theme support, mobile responsive (stacked layout at ≤768px).
- **Workspace API methods** on frontend `API` module: `getWorkspace`, `listWorkspaceFiles`, `readWorkspaceFile`, `writeWorkspaceFile`, `deleteWorkspaceFile`, `mkdirWorkspace`, `getWorkspaceGitStatus`, `getWorkspaceGitBranches`.
- **`Surfaces.getSavedFragment()` / `putSavedFragment()`** — Cross-surface DOM sharing. Allows the editor surface to borrow chat DOM into its split pane without cloning.
- **`workspace.file.` event routing** added to server event route table (`DirToClient`).
- **Workspace management UI**: Create, list, and bind workspaces from the frontend. Project settings panel gains a Workspace section with dropdown picker and "New" button. Chat context menu gains "Set workspace…" option for per-channel override. Both paths support creating new workspaces inline.
- **`GET /workspaces`** — List all workspaces accessible to the current user (user-owned + team-owned).
- **`workspace_id` in channel API**: `updateChannelRequest` accepts `workspace_id` for binding/unbinding. `channelResponse` and both list/get queries now include `workspace_id`.

### Changed
- `stream_loop.go`: Emits `workspace.file.changed` event after successful `workspace_write`/`workspace_patch` tool calls.
- `index.html`: Added `editor-mode.css` stylesheet and `editor-mode.js` script.
- `channels.go`: `channelResponse` includes `workspace_id`, list/get queries select it, update accepts it.
- `workspaces.go`: Added `List` handler for `GET /workspaces`.
- `main.go`: Added `GET /workspaces` route.
- `projects-ui.js`: Workspace section in project panel, workspace picker in chat context menu.
- `styles.css`: Workspace row layout in project panel.

## [0.21.4] — 2026-03-01

### Added
- **Git Integration.** Workspaces can now track a git remote. Operations use `os/exec` calling the `git` binary (no CGO, no Go git libraries). Credentials are vault-encrypted (AES-256-GCM) using the same pattern as BYOK provider configs.
- **`git_credentials` table.** Postgres + SQLite migrations. Stores encrypted PAT tokens, HTTP basic auth, and SSH private keys. Columns: id, user_id, name, auth_type, encrypted_data, nonce, created_at.
- **Workspace git columns.** `git_remote_url`, `git_branch`, `git_credential_id`, `git_last_sync` added to `workspaces` table via migration.
- **`workspace.GitOps`** — exec-based git operations: Clone, Pull, Push, Status, Diff, Commit, Log, BranchList, Checkout. Credential injection via temporary `GIT_ASKPASS` scripts (PAT), `.git-credentials` files (basic auth), or `GIT_SSH_COMMAND` (SSH keys). Temp files securely wiped after each operation.
- **Post-operation hooks.** Clone, pull, and checkout automatically trigger workspace reconcile (filesystem → DB sync) and re-index changed files through the v0.21.2 indexing pipeline.
- **5 git tools** for LLM use: `git_status`, `git_diff`, `git_commit`, `git_log`, `git_branch`. Filtered out when no workspace is bound. Each validates git remote configuration before execution.
- **9 git API endpoints:** `POST clone`, `POST pull`, `POST push`, `GET status`, `GET diff`, `POST commit`, `GET log`, `GET branches`, `POST checkout` — all under `/api/v1/workspaces/:id/git/`.
- **3 credential endpoints:** `POST /api/v1/git-credentials` (create), `GET /api/v1/git-credentials` (list user-scoped summaries), `DELETE /api/v1/git-credentials/:id` (delete). Encrypted data never exposed in API responses.
- **`GitCredentialStore` interface** + Postgres/SQLite implementations. Create, GetByID, ListByUser, Delete with user-scoped authorization.
- **Security.** `file://` and local path URLs rejected in clone. Error output sanitized to strip credential-containing lines. `GIT_TERMINAL_PROMPT=0` set on all operations to prevent interactive prompts.

### Changed
- `WorkspaceStore` interface: added `SetGitLastSync()` method + both implementations.
- `models.Workspace`: added git tracking fields. `models.WorkspacePatch`: added git patch fields.
- Completion handler: git tools disabled alongside workspace tools when no workspace bound.
- `store.Stores` struct: added `GitCredentials` field.
- Postgres/SQLite `NewStores()`: wires `GitCredentialStore`.

## [0.21.3] — 2026-03-01

### Added
- **Surface Registry (`surfaces.js`).** Mode-switching system that allows extensions to register "surfaces" (UI modes) that take over named regions of the interface. DOM nodes are detached and preserved in `DocumentFragment`s during mode switches — not destroyed — ensuring CM6 editor instances and other stateful components survive transitions.
- **Surface region attributes.** Four `data-surface-region` attributes on `index.html` containers: `surface-header` (model bar), `surface-main` (chat messages), `surface-footer` (input area), `sidebar-content` (search + chat history). Extensions swap these regions via `ctx.ui.replace()` / `ctx.ui.restore()`.
- **Mode selector.** Appears in the sidebar (`#modeSelectorWrap`) when ≥1 extension surface is registered beyond the default chat. Shows icon buttons for each mode with active state highlighting.
- **Extension context API.** `ctx.surfaces.register()`, `ctx.surfaces.unregister()`, `ctx.surfaces.activate()`, `ctx.surfaces.getCurrent()` on the scoped extension context. `ctx.ui.replace()` and `ctx.ui.restore()` for region DOM management.
- **Surface events.** `surface.activated`, `surface.deactivated`, `surface.registered`, `surface.unregistered` on the EventBus (all `localOnly`).
- **REPL console (`repl.js`).** Fourth tab in the debug modal (Ctrl+Shift+L). `AsyncFunction` wrapper for top-level `await`. Injected globals: `API`, `Events`, `Extensions`, `Surfaces`, `DebugLog`, `Panels`, `UI`, plus `$()`, `$$()`, `sleep()` helpers. Features: collapsible JSON pretty-printing, red errors with expandable stack traces, command history via ↑/↓ (persisted to sessionStorage), tab-completion on live object graphs and EventBus labels, multi-line input (Shift+Enter), admin-gated (admin role OR `?debug=1` URL param).
- **CSS.** Mode selector styles (`.mode-selector`, `.mode-btn`, active/hover states). REPL styles (output formatting, value-type color coding, collapsible JSON, input prompt).

### Changed
- `extensions.js` context builder: added `ctx.surfaces` namespace and `ctx.ui.replace()` / `ctx.ui.restore()` methods.
- `app.js` startup: initializes `Surfaces.init()` before `Extensions.loadAll()`, and `REPL.init()` after auth confirmation.
- `index.html`: added `data-surface-region` attributes, mode selector container, REPL tab in debug modal, script tags for `surfaces.js` and `repl.js`.
- `EXTENSIONS.md` §6: updated with implementation details, actual API signatures, and event catalog.

## [0.21.2] — 2026-03-01

### Added
- **Workspace Indexing Pipeline.** Background text chunking and embedding for workspace files, reusing the existing `knowledge.SplitText` chunker and `knowledge.Embedder` for vector generation. Indexable file types include 40+ source code extensions (Go, Rust, Python, TypeScript, Perl, etc.) plus all `text/*` MIME types. Code-aware chunking uses 1500-character chunks with function/class/type boundary separators (`\n\nfunc `, `\n\nfn `, `\n\nclass `, `\n\ndef `, `\n\ntype `, `\n\nsub `, `\n\npub `, `\n\nimpl `), falling back to paragraph and line breaks.
- **Content-addressed skip.** SHA256 computed during `WriteFile` is compared against the prior hash before triggering re-indexing. Unchanged files skip the chunk + embed pipeline entirely, making archive extracts and bulk writes efficient.
- **`workspace_chunks` table.** New table (Postgres + SQLite migrations) storing text chunks with vector embeddings per workspace file. Postgres uses sequential scan with pgvector `<=>` cosine operator (no IVFFlat/HNSW index — 3072-dim embeddings exceed the 2000-dim index limit; sequential scan is adequate at workspace scale). SQLite uses app-level cosine in Go. Columns: workspace_id, file_id, chunk_index, content, token_count, embedding, metadata (JSONB with line_start, language).
- **`workspace_files` additions.** `index_status` column (`pending`, `indexing`, `ready`, `error`, `skipped`) and `chunk_count` for tracking indexing progress per file. `workspaces` table gains `indexing_enabled` boolean (default true).
- **`WorkspaceStore` chunk methods.** Four new store interface methods implemented for both Postgres and SQLite: `InsertChunks` (batch insert with pgvector cast or JSON text), `DeleteChunksByFile`, `SimilaritySearch` (pgvector `<=>` operator or app-level cosine), `UpdateFileIndexStatus`.
- **`workspace.Indexer`.** Background indexing orchestrator with configurable concurrency semaphore. Single-file indexing (`IndexFile`) triggered on `WriteFile` when content changes. Batch indexing (`IndexBatch`) triggered after `ExtractArchive`. Async goroutines with 5-minute timeout per file. Embedding usage tracked via `Embedder.LogUsage`.
- **`workspace_search` tool.** Semantic search across workspace files via natural language query. Embeds the query, runs cosine similarity against workspace chunks, returns file paths, content snippets, relevance scores, and approximate line numbers. Optional `file_pattern` glob filtering (e.g. `*.go`, `src/*.ts`) applied post-search. Top-K capped at 20.
- **Indexer integration.** `workspace.FS.SetIndexer()` hooks the indexer into the write path. `WriteFile` triggers single-file indexing on content change. `ExtractArchive` triggers batch indexing for all extracted files. Both use the workspace owner's identity for embedding provider resolution.
- **Configuration.** `WORKSPACE_INDEXING_ENABLED` env var (global kill switch, default true). `WORKSPACE_INDEX_CONCURRENCY` env var (default 2). Per-workspace `indexing_enabled` toggle via `WorkspacePatch`. Indexing gracefully degrades when no embedding role is configured.
- **Index status endpoint.** `GET /api/v1/workspaces/:id/index-status` returns aggregated indexing progress: per-status file counts (pending, indexing, ready, error, skipped), total chunk count, and workspace indexing_enabled flag.

### Changed
- `workspace_files` scanner updated in both Postgres and SQLite stores to include `index_status` and `chunk_count` columns.
- `workspaces` scanner updated to include `indexing_enabled` column.
- `WorkspacePatch` model extended with `IndexingEnabled` field.
- `WorkspaceToolNames()` now includes `workspace_search` in the disabled set when no workspace is bound.
- `RegisterWorkspaceSearchTool()` added for late registration of the search tool (requires embedder).

## [0.21.1] — 2026-03-01

### Added
- **Workspace Tools.** Six AI-callable tools in the `workspace` category: `workspace_ls` (list files with content type/size), `workspace_read` (text content with 50KB soft limit, binary detection), `workspace_write` (create/overwrite with auto-mkdir), `workspace_rm` (delete with recursive guard), `workspace_mv` (move/rename with auto-mkdir), `workspace_patch` (find/replace operations, each match must be unique, 1MB file limit). Late registration via `RegisterWorkspaceTools()` after stores + FS init. `WorkspaceToolNames()` returns the full list for filtering.
- **Channel Workspace Binding.** `channels.workspace_id` nullable FK column (Postgres + SQLite migration 010/009). Channels with a bound workspace get workspace tools auto-injected into the completion tool set.
- **Project Workspace Binding.** `projects.workspace_id` nullable FK column. Projects can bind a workspace shared by all channels in the project.
- **Workspace Resolution Chain.** `ChannelStore.ResolveWorkspaceID()` resolves the effective workspace for a channel: channel `workspace_id` takes priority, falling back to the project's `workspace_id` via `project_channels` join. Both Postgres and SQLite implementations. Returns empty string when no workspace is bound.
- **Tool Injection in Completion Handler.** `buildToolDefs()` accepts `workspaceID` parameter; when empty, all workspace tool names are added to the disabled set. `ExecutionContext.WorkspaceID` field carries the resolved workspace ID through tool execution and streaming.
- **Workspace resolution wired into streaming.** Both `CompletionHandler` and `streamWithToolLoop` resolve the workspace ID from the channel and pass it through to tool execution contexts.

### Deferred
- Frontend workspace UI (channel settings toggle, project Files tab, chat bar workspace indicator) deferred to a future release.
- Archive-to-workspace upload flow (detect archive MIME + workspace binding → extract to workspace) deferred.

## [0.21.0] — 2026-03-01

### Added
- **Workspace Storage Primitive.** Platform-level file storage bound to users, projects, channels, or teams via polymorphic owner model. Dual-layer architecture: PVC filesystem (source of truth) with DB metadata index (queryable cache). Workspaces support configurable quotas, status lifecycle (active/archived/deleting), and owner-based authorization inheritance.
- **Workspace data model.** Two new tables: `workspaces` (polymorphic owner_type/owner_id, root_path, max_bytes quota, status) and `workspace_files` (path, MIME type, size, sha256, is_directory). Unique index on (workspace_id, path) enables upsert-on-conflict for file metadata sync. Migrations for both Postgres and SQLite.
- **`workspace.FS` package.** Filesystem operations layer with security-first design: atomic writes (temp file + rename with SHA256 computed via tee reader), path traversal guards (cleanPath normalization + absPath containment validation), symlink rejection on write targets. Operations: ReadFile, WriteFile, DeleteFile (with recursive guard), Mkdir, Stat, ListDir, Tree, Reconcile (filesystem→DB drift sync).
- **Archive operations.** Extract zip and tar.gz archives into workspaces with bomb protection: 10K file limit, 100MB single file cap, workspace quota enforcement during extraction. Common-prefix stripping handles GitHub-style `project-name/` wrapper directories. CreateArchive packages workspaces into downloadable zip or tar.gz.
- **Content type detection.** Extension-based MIME detection covering 40+ source code types (Go, Rust, Python, TypeScript, etc.) with `http.DetectContentType` sniffing fallback for unknown extensions.
- **`WorkspaceStore` interface.** Full CRUD for workspaces, file index operations (upsert, delete, delete-by-prefix, get, list with recursive/non-recursive modes), ownership lookup (GetByOwner, ListByOwner), and aggregate stats. Postgres and SQLite implementations.
- **Workspace API.** 15 new endpoints under `/api/v1/workspaces`: workspace CRUD (create, get, update, delete), file operations (list, read, write, delete, mkdir), archive management (upload with extraction, download), reconcile (FS→DB sync), stats. Owner-based authorization: user workspaces require self, channel workspaces require channel owner, project workspaces require project member, team workspaces require team member.
- **Unit tests.** Path cleaning (13 cases including traversal, dotfiles, whitespace), absPath traversal detection, MIME detection (14 extensions), unsafe path filtering (7 cases), common prefix detection (5 cases), write/read round-trip with mock store, delete verification, mkdir with index sync.

## [0.20.0] — 2026-03-01

### Added
- **Notifications Core (Phase 1)**: Persistent, user-targeted notification infrastructure with real-time WebSocket delivery. `notifications` table (Postgres + SQLite), `NotificationStore` with paginated queries, `Service.Notify()` / `NotifyMany()` for centralized creation and dispatch. Five API endpoints: list (paginated, filterable), unread count, mark read, mark all read, delete. Bell icon in header bar with unread count badge (capped at 9+). Notification dropdown (latest 10, grouped, click-to-navigate via `resource_type`/`resource_id`). Full notification panel registered with `PanelRegistry`. WebSocket push via `notification.new` event with toast for high-priority types (`kb.error`, `role.fallback`). Background cleanup goroutine (configurable retention, default 90 days). Initial sources: `role.fallback` (via EventBus subscription), `kb.ready`/`kb.error` (knowledge base processing), `grant.changed` (group membership).
- **@mention Parsing + Multi-model Routing (Phase 2)**: Channels support multiple AI models with @mention-based routing. `mentions.Parse()` extracts @mentions from message content, resolves against channel model roster (case-insensitive, longest-match-first, trailing punctuation tolerant). Completion handler fans out sequentially to mentioned model(s), producing one assistant response per target. Without @mention, default channel model responds (fully backward compatible). Channel model CRUD: 4 new endpoints for add/remove/update/list. Frontend: model pills in chat header, @mention autocomplete (CM6 `mentionCompletion` extension with roster-backed suggestions), model attribution labels on multi-model responses. Message `model_display` field for human-readable attribution. SSE streaming tagged with model info per response.
- **Email Transport + Notification Preferences (Phase 3)**: SMTP email delivery via `EmailTransport` supporting implicit TLS (port 465) and STARTTLS (port 587). Multipart MIME messages (HTML + plaintext) with branded templates using Go `html/template`. `notification_preferences` table with three-tier resolution: specific type → user wildcard `*` → system default (in_app=true, email=false). Three preference API endpoints (list, set with partial patch, delete). Admin SMTP configuration in settings (host, port, user, password, from address, TLS mode) with test email endpoint. User notification preferences UI in Settings → Notifications tab with per-type in-app/email checkboxes. Async email delivery (goroutine with 30s timeout, failures logged non-blocking).
- **Gin Release Mode**: Backend now automatically sets `gin.SetMode(gin.ReleaseMode)` when `ENVIRONMENT=production`, suppressing per-request access logs for health checks and reducing log noise. `GIN_MODE` env var also added to K8s backend deployment as explicit override.

### Fixed
- **Model preferences 500 on every page load**: `GET /api/v1/models/preferences` returned HTTP 500 due to `NULL` values in `user_model_settings.hidden` and `sort_order` columns failing Go `sql.Scan()` into non-pointer types. Root cause: the `Set` upsert passed `NULL` for unset patch fields, bypassing `DEFAULT false`/`DEFAULT 0` on INSERT. Fixed with `COALESCE` in both SELECT (read path) and INSERT VALUES (write path) for Postgres and SQLite. Includes data-fix SQL for existing NULL rows.

## [0.19.2] — 2026-02-28

### Added
- **Project Persona Default**: Bind a persona to a project via the detail panel. All chats in the project inherit the persona's model, parameters, and system prompt as a fallback when no explicit preset is selected. Resolution chain: explicit request → project persona → none.
- **Project Archive Toggle**: Archive/unarchive projects from the detail panel. Archived projects hidden from sidebar by default with "Show archived (N)" toggle. Dimmed visual treatment when shown.
- **Channel Reorder**: Right-click a chat within a project for "Move up" / "Move down" options. Server-persisted positions via `project_channels.position`, loaded on startup, maintained across moves.

## [0.19.1] — 2026-02-28

### Added
- **Active Project**: Pin a project as active; new chats auto-assign to it. Persists across reloads via localStorage. Visual indicator (📌 + accent border) in sidebar.
- **Project System Prompt**: Per-project instructions stored in `projects.settings` JSONB. Injected between persona/channel prompt and KB hint during completion. Merge semantics on update (preserves other settings keys).
- **Project Detail Panel**: Side panel (via PanelRegistry) for managing project system prompt, KB bindings, and notes. Accessible from project ⋯ menu → "Project settings".
- Enriched `ListKBs` and `ListNotes` responses with JOIN-sourced `name`/`title` fields for display in the project panel.

### Changed
- `ProjectPatch` model now accepts `settings` field for partial settings merge.
- Project context menu expanded: "Pin as active", "Project settings", plus existing rename/color/delete.

## [0.19.0] — 2026-02-28

### Added
- **Projects / Workspaces.** Organizational containers that group related
  conversations, knowledge bases, and notes into a single workspace.
  Projects provide a scope-aware organizational layer above individual
  channels, with support for personal, team, and global visibility.
- **Project data model.** Four new tables: `projects` (with scope, owner,
  team, color, icon, settings JSONB), `project_channels` (ordered
  membership with UNIQUE constraint), `project_knowledge_bases` (with
  auto_search flag), and `project_notes`. Channels gain a denormalized
  `project_id` FK for efficient filtering.
- **Project API.** 17 new endpoints under `/api/v1/projects`: full CRUD,
  channel add/remove/list/reorder, KB add/remove/list, note
  add/remove/list. Access checks enforce owner-or-team-member visibility
  with owner-only delete.
- **Project KB resolution.** Knowledge bases bound to a project are
  automatically available to all channels within that project. Resolution
  chain extended: Persona KBs → **Project KBs** → Channel KBs →
  Personal KBs. Both `BuildKBHint` (system prompt injection) and
  `kbsearch` (tool-time retrieval) updated.
- **Note auto-association.** Notes created from a channel that belongs to
  a project are automatically added to that project's note collection.
- **Sidebar project groups.** Projects appear as collapsible groups in the
  sidebar above the existing time-based "Recent" section. Each group shows
  a color dot, chat count, and an options menu (⋯) for rename, color
  picker, and delete.
- **Drag-and-drop.** Drag chat items between project groups or back to
  Recent. Visual feedback with outline and background highlight on valid
  drop targets.
- **Right-click context menu.** Right-click any chat to move it to a
  project, remove it from its current project, or create a new project
  and assign in one step.
- **New Project button.** Added to the New Chat split-button dropdown for
  quick project creation.
- **Channel project_id filter.** `GET /api/v1/channels` accepts
  `?project_id=<uuid>` to filter by project, or `?project_id=none` for
  unassigned channels. Response includes `project_id` field.

### Changed
- `renderChatList()` rewritten to support project grouping while
  preserving the original time-based layout when no projects exist.
  Chat items now include `draggable`, `oncontextmenu`, and drag event
  handlers.
- Channel response struct, SELECT queries, and scan calls updated across
  `ListChannels`, `GetChannel`, and `CreateChannel` (both Postgres and
  SQLite paths) to include `project_id`.
- `resource_grants` CHECK constraint extended to include `'project'` as a
  valid resource type.
- `db-validate.sh` updated: former "Dropped tables" assertions for
  `projects` and `project_channels` replaced with positive checks for all
  four project tables plus `channels.project_id` column check.
- Test helper truncation list updated with project junction tables.

### Fixed
- **JSON corruption defense** (hotfix carry-forward from 0.18.2):
  `SafeJSON` wrapper with `scanJSON` and `scanTags` hardened helpers that
  replace bare `json.RawMessage` / `pq.Array` scanning. Prevents
  `encoding/json: invalid character` panics from NULL or empty columns.
- **Service worker** (hotfix carry-forward): `chrome-extension://` URL
  filtering to avoid opaque response cache errors.

## [0.18.1] — 2026-02-28

### Added
- **Side panel architecture.** Complete rewrite of the side panel system
  from shared-tab layout to independent single-slot panels. Any action
  (preview, notes, diagram pop-out) fills the slot, replacing whatever
  was there — no tabs, no association between panel types.
- **Panel registry** (`PanelRegistry`): named panels with independent
  open/close state, scroll/state preservation across switches, keyboard
  shortcuts (Ctrl+\ cycle, Ctrl+Shift+\ toggle dual-view).
- **Dual-view mode**: two panels side-by-side via CSS grid with a
  drag-adjustable split ratio (0.2–0.8 range, 6px divider handle).
  Toggle button in header actions area alongside fullscreen and close.
- **Live HTML preview**: streaming responses update the preview iframe
  in real-time (500ms debounce). Extracts the last fenced HTML block
  from partial content and renders it as the response streams in.
- **Extension pop-out**: `⧉` button on rendered extension blocks
  (mermaid, KaTeX, etc.) clones the content into the preview iframe
  and opens the side panel.
- **Extension UI primitives** (`ctx.ui`): seven methods exposed to
  browser extensions through the scoped extension context:
  - `toast(msg, type)` — toast notifications via `UI.toast()`
  - `openPreview(html)` — load HTML into side panel preview iframe
  - `isDark()` — theme detection without DOM sniffing
  - `isMobile()` — viewport width check (≤768px)
  - `isPanelOpen()` — side panel container visibility
  - `confirm(msg, opts)` — modal confirm dialog (Promise\<boolean>)
  - `createMenu(anchor, opts)` — popup menu (unchanged from stub)
- **Mermaid context-aware expand**: single `⛶` button replaces the
  previous two-button (pop-out + fullscreen) approach. When the side
  panel is open, expand pops the diagram into it; when closed, expand
  goes fullscreen.
- **Mermaid fullscreen close button**: 40px circular close button
  overlaid top-right in fullscreen mode, 48px on mobile. Fixes the
  previous Escape-key-only exit which was unusable on touch devices.
- **Mobile side panel**: swipe navigation between panels (80px
  threshold, 1.5× horizontal-to-vertical ratio), tap-to-close overlay,
  responsive auto-collapse of dual mode on narrow viewports, enlarged
  touch targets for all panel controls.
- **Side panel header label**: simple text label showing the active
  panel name, replacing the previous tab bar UI.

### Changed
- Side panel model changed from tabbed (Preview + Notes tabs visible
  simultaneously) to single-slot (one panel fills the space, actions
  replace it). No user-selectable tabs — content is entirely
  action-driven.
- Dual-view toggle button moved from tab bar (dynamically injected)
  to static header actions area next to fullscreen and close.
- Mermaid extension refactored to use `ctx.ui` primitives exclusively.
  Zero direct references to `UI.*`, `PanelRegistry.*`, or DOM class
  sniffing for theme detection. Extension remains fully self-contained
  in `extensions/builtin/mermaid-renderer/`.
- Mermaid source copy uses `ctx.ui.toast()` instead of inline button
  text swap. Theme detection uses `ctx.ui.isDark()` instead of manual
  `document.body.classList.contains('dark-theme')` check.
- Side panel outer resize minimum bumped to 480px in dual mode (vs
  280px single).

### Removed
- Tab bar UI (`.side-panel-tabs`, `.side-panel-tab`, tab rendering
  logic). Panels no longer have user-selectable tabs.
- Separate pop-out and fullscreen buttons in mermaid toolbar (collapsed
  into single context-aware expand button).

## [0.18.0] — 2026-02-28

### Added
- **Memory system.** Long-term memory across conversations with scope-aware
  isolation. Three memory scopes: `user` (personal facts/preferences),
  `persona` (shared across all users of a Persona), and `persona_user`
  (per-user within a Persona context, e.g. tutoring progress per student).
  Memories persist across channels and are injected into the system prompt
  at completion time with scope priority (persona_user > persona > user).
- **Memory tools.** Two new LLM-callable tools:
  - `memory_save` — LLM explicitly stores a fact with key/value/confidence.
    Scope-aware: saves to the active scope for the current Persona context.
  - `memory_recall` — LLM queries stored facts relevant to current context.
    Merges results from applicable scopes with semantic search via embeddings
    and keyword fallback.
- **Automatic memory extraction.** Background scanner finds conversations
  with sufficient new activity, sends them to the utility model role for
  fact extraction, and stores results as `pending_review` memories.
  Configurable extraction prompt per Persona (e.g. "extract FAQ-worthy
  Q&A pairs"). Scanner runs on a configurable interval with concurrency
  control. Global kill switch via admin settings.
- **Memory review pipeline.** Extracted memories start in `pending_review`
  status. Admin panel shows pending review queue with bulk approve. Users
  can approve/reject/edit their own pending memories from the Settings →
  Memory tab.
- **User memory management.** Settings → Memory tab shows active/pending
  memory counts, filterable/searchable memory list with inline edit and
  delete. Status filter (active, pending_review, archived). Approve All
  button for batch operations on pending memories.
- **Admin memory controls.** Admin panel → Memory section shows system-wide
  pending review queue. Memory extraction toggle in admin Settings panel
  (`memory_extraction_enabled`). Bulk approve endpoint for batch review.
- **Hybrid semantic recall.** Memory recall supports both keyword search
  and vector similarity (cosine distance). Postgres uses `<=>` operator
  with pgvector; SQLite computes cosine similarity in Go with app-level
  vector loading. Results are merged and deduplicated.
- **Memory injection at completion time.** `BuildMemoryHint()` loads
  relevant memories and formats them as a system prompt section, injected
  after the knowledge base hint. Context-budget aware with configurable
  character limit. Supports embedding-based relevance filtering when the
  user's latest message is available.
- **Persona memory configuration.** Personas gain `memory_enabled` (bool)
  and `memory_extraction_prompt` (text) fields. When memory is enabled on
  a Persona, conversations with that Persona contribute to persona-scoped
  memory extraction. Custom extraction prompts allow specialization
  (e.g. helpdesk FAQ extraction vs. tutoring progress tracking).
- **Database migrations.** Four new migration files (Postgres + SQLite):
  - `004_v0180_memories.sql` / `sqlite/003_v0180_memories.sql` — `memories`
    table with composite unique index, full-text search index (GIN/keyword),
    `memory_extraction_log` tracking table.
  - `005_v0180_memory_phase2.sql` / `sqlite/004_v0180_memory_phase2.sql` —
    Persona memory columns, extraction log unique constraint.
- **API endpoints.** Eight new authenticated endpoints:
  - `GET /memories` — list user's memories (filterable by status/query)
  - `GET /memories/count` — active + pending counts
  - `PUT /memories/:id` — edit a memory's key/value/confidence
  - `DELETE /memories/:id` — delete a memory
  - `POST /memories/:id/approve` — approve a pending memory
  - `POST /memories/:id/reject` — reject (archive) a pending memory
  - `GET /admin/memories/pending` — admin pending review queue
  - `POST /admin/memories/bulk-approve` — admin bulk approve

### Changed
- `CompletionHandler` now accepts an `*knowledge.Embedder` parameter for
  memory injection with semantic relevance filtering.
- Persona create/update forms include memory configuration fields
  (enabled toggle, extraction prompt textarea).
- Admin settings save handler includes `memory_extraction` and
  `memory_extraction_enabled` keys.
- `store.Stores` struct includes `Memories MemoryStore` field.
- Admin panel sections include Memory with pending review loader.

### Technical Notes
- Memory embeddings use `vector(3072)` matching the existing KB/notes
  schema. HNSW index is not used (pgvector limits HNSW to 2000 dims);
  filtered sequential scans are performant for per-user memory tables.
  IVFFlat or dimension reduction available as future optimizations.
- SQLite hybrid recall loads embeddings into Go and computes cosine
  similarity at the application level, reusing the existing
  `cosineSimilarity()` function from the knowledge base store.
- Memory tools use late registration (like KB search and note tools)
  because they require stores and embedder dependencies initialized
  in main.go.

## [0.17.3] — 2026-02-28

### Added
- **Wikilink bi-directional linking.** Notes support `[[Title]]` and
  `[[Title|display text]]` syntax. Links are extracted on save via regex,
  resolved to target note IDs by case-insensitive title match, and stored
  in a `note_links` junction table. Dangling links (references to notes
  that don't exist yet) are preserved and automatically resolved when a
  matching note is created later.
- **Transclusion embeds.** `![[Title]]` syntax renders embedded note content
  inline in read mode. Content is fetched asynchronously with a recursion
  guard (max depth 1 — nested transclusions render as plain text references).
  Transclusion links are visually distinct in both the editor (border-left,
  italic) and the graph (dashed edges).
- **Backlinks panel.** Read mode shows a collapsible "Linked mentions" panel
  below the note content listing all notes that link to the current note.
  Each backlink is clickable to navigate directly. Count badge updates on
  every note open.
- **Knowledge graph visualization.** Canvas-based force-directed graph with
  no external dependencies (~480 lines). Physics: O(n²) Coulomb repulsion,
  Hooke spring attraction on edges, center gravity. Interaction: pan, zoom
  (0.15–4.0x toward cursor), drag nodes, hover highlights node + neighbors.
  Click opens note editor. Nodes sized by √(link_count), colored by folder
  path (10-color palette). Ghost nodes for unresolved `[[links]]` with
  toggle button. Energy-based pause (stops rAF when total kinetic energy
  falls below threshold). ResizeObserver for responsive canvas sizing.
- **CM6 note editor.** New `CM.noteEditor()` factory function with live
  markdown preview (heading sizes for h1–h3, blockquote styling, fenced code
  block decorations), `[[wikilink]]` autocomplete triggered by `[[` with
  async title search, and clickable wikilink chip rendering. Falls back to
  plain `<textarea>` if CM6 bundle is unavailable.
- **Wikilink autocomplete.** Typing `[[` in the note editor triggers an
  async completion popup backed by `GET /notes/search-titles?q=`. Results
  are fetched via `ILIKE` title match, limited to 8 suggestions. Selecting
  a result inserts the full `[[Title]]` syntax.
- **Daily notes.** "Today" button in the notes toolbar creates or opens a
  daily note titled `Daily — YYYY-MM-DD` in the `/daily/` folder with a
  starter template (Tasks + Notes sections). Idempotent — repeated clicks
  navigate to the existing daily note.
- **Save-to-note from chat.** "Note" button in message action bar captures
  the full message content (or the current text selection within that message)
  into a new note with pre-filled title extracted from the first line.
  Provenance is tracked via `source_message_id` column on the notes table,
  enabling future jump-to-source navigation.
- **API endpoints.** Three new authenticated endpoints:
  - `GET /notes/search-titles?q=&limit=` — lightweight title search for
    autocomplete (returns `[{id, title}]`).
  - `GET /notes/:id/backlinks` — notes linking to the specified note, with
    display text and metadata.
  - `GET /notes/graph` — full graph topology: nodes (with inbound/outbound
    link counts), resolved edges, and unresolved (dangling) link titles.
- **`note_links` table.** New junction table with `source_note_id`,
  `target_note_id` (nullable for dangling links), `target_title`,
  `display_text`, `is_transclusion`, and `created_at`. Primary key on
  `(source_note_id, target_title)`. Index on `target_note_id` for backlink
  queries. Migrations for both Postgres and SQLite.
- **`source_message_id` column.** New nullable UUID column on `notes` table
  for chat-to-note provenance tracking.
- **Wikilink extraction package.** Standalone `notelinks/` package with
  regex-based parser handling `[[Title]]`, `[[Title|Display]]`,
  `![[Title]]`, and `![[Title|Display]]`. Deduplicates by lowercase title,
  preserves first occurrence. 10 unit tests covering edge cases.

### Changed
- Notes editor replaces `<textarea>` with CM6 `noteEditor` instance. The
  container `#noteEditorContentContainer` is lazily initialized on first
  edit; destroyed on panel close to avoid stale state.
- Note create and update handlers now extract wikilinks from content and
  call `ReplaceLinks()` (transactional DELETE + batch INSERT). Create also
  calls `ResolveByTitle()` to fix dangling links from other notes.
- `showNotesList()` destroys the CM6 editor instance and hides graph view.
- `saveNote()` and `deleteNote()` call `invalidateNoteGraph()` to clear
  the cached graph data.
- Read mode renders `[[wikilinks]]` as styled clickable chips via post-
  processing of the formatted HTML. Clicking navigates to the linked note
  or offers to create it if not found.
- `ARCHITECTURE.md` updated with `notelinks/` package, `note-graph.js`,
  `CM.noteEditor()` factory, and expanded notes description covering the
  linking model.
- `ROADMAP.md` updated with full v0.17.3 section including all checklist
  items.
- CM6 bundle entrypoint (`index.mjs`) exports `noteEditor` alongside
  existing `chatInput` and `codeEditor`.
- `theme.mjs` adds `noteEditorTheme` with full-height layout (min 200px,
  max 60vh), heading size decorations, and blockquote styling.

## [0.17.2] — 2026-02-28

### Added
- **CodeMirror 6 integration.** Rich editor infrastructure compiled at Docker
  build time via esbuild (IIFE bundle, ~295KB min / ~90KB gzip). Two factory
  functions exposed on `window.CM`:
  - `CM.chatInput()` — Markdown-mode editor for the chat input with
    auto-growing height, Enter=send / Shift+Enter=newline, spell check, and
    WYSIWYG fenced code block decorations (visual container with monospace
    font and accent border, matching claude.ai UX).
  - `CM.codeEditor()` — Full-featured code editor for admin extension panel
    with line numbers, bracket matching, search/replace, fold gutter, and 10
    bundled language modes (Markdown, JavaScript, JSON, SQL, HTML, CSS, YAML,
    Go, Python, Rust).
- **Graceful degradation.** All CM6 integration points check `window.CM`
  availability. If the bundle fails to load, the app falls back to native
  `<textarea>` with zero breakage.
- **Dark/Light/System theme toggle.** New appearance setting with three
  modes. Light theme overrides all CSS variables via `[data-theme="light"]`
  selector. System mode tracks `prefers-color-scheme` media query in real
  time. Theme changes emit `theme.changed` on the EventBus; CM6 editors
  toggle `oneDark` syntax theme via compartment reconfiguration.
- **Vim/Emacs keybinding preference.** Editor keybinding mode (Standard /
  Vim / Emacs) configurable in appearance settings. Applies to code editors
  and extension editors only — chat input always uses standard keybindings.
  Live-switchable on already-open editors via `keymap.changed` event.
  Bundled statically (~40KB for both modes).
- **Inline code shortcut.** Ctrl/Cmd+E wraps selection in backticks or
  inserts an empty inline code pair with cursor between them.
- **Code block shortcut.** Typing ` ``` ` at the start of a line expands
  to a fenced code block with cursor positioned inside. The decoration plugin
  renders code blocks with a styled visual container in the chat input.
- **CI path-based change detection.** New `detect-changes` job classifies
  changed files into frontend/backend/infra/docs buckets. Test jobs skip
  when irrelevant (FE-only changes skip Go tests, docs-only changes skip
  all tests and deploy). Tags always run the full pipeline.

### Changed
- Docker build pipeline: both `Dockerfile.frontend` and unified `Dockerfile`
  now include a `cm6-build` stage (Node 20 Alpine → esbuild → IIFE bundle).
- `ChatInput` abstraction in `chat.js` replaces direct textarea access
  across 7 callsites (`chat.js`, `tokens.js`, `attachments.js`).
- Extension editor in `admin-handlers.js` uses `CM.codeEditor()` with JSON
  and JavaScript modes, replacing bare `<textarea>` with manual Tab handler.
- Service worker excludes `/vendor/codemirror/` from cache (version-busted).
- Debug state snapshot includes CM6 version and language list.
- `ARCHITECTURE.md` updated to v0.17 reflecting CM6 integration, SQLite
  dual-driver, modular frontend file structure, and theme system.
- CI pipeline header updated to v0.17.2 with path gating documentation.
- `build-editor.sh` falls back to `npm install` if `package-lock.json`
  is missing (belt-and-suspenders for local dev).

### Fixed
- **App initialization crash.** `Events.publish` (nonexistent) → `Events.emit`
  (correct API). The unhandled exception during `initAppearance()` killed
  `initListeners()`, leaving the entire app half-initialized — settings modal
  unclosable, keyboard shortcuts unwired, paste handlers missing.
- **Cursor invisible in dark and light mode.** CM6 cursor used `--accent`
  color (low contrast on both themes). Switched to `--text` for consistent
  visibility. Added explicit `borderLeftWidth: 2px`.
- **Placeholder text offset.** Double padding between `.cm-editor` wrapper
  (12px) and `.cm-content` (8px) pushed placeholder 20px below expected
  position. Zeroed `.cm-content` padding — wrapper is the single source of
  truth.

## [0.17.1] — 2026-02-27

### Added
- **SQLite backend.** Full dual-driver database layer — set `DB_DRIVER=sqlite`
  to run with an embedded SQLite database. Pure Go (no CGO), zero external
  dependencies. 19 store files covering all domain stores: channels, messages,
  users, teams, personas, knowledge bases, notes, usage, audit, extensions,
  and more. Feature parity with Postgres including knowledge base vector
  search via app-level cosine similarity computed in Go.
- **Dialect-aware test infrastructure.** `database.SetupTestDB()` detects
  `DB_DRIVER` and provisions either a Postgres test database or a SQLite
  temp file. Exported `database.PH(n)` returns `$N` or `?` per dialect.
  `database.TruncateAll()` uses `TRUNCATE CASCADE` on Postgres and
  `DELETE FROM` with `PRAGMA foreign_keys` toggling on SQLite.
  `dialectSQL()` helper in handler tests converts `$N` placeholders and
  strips `::jsonb` casts at runtime.
- **SQLite CI pipeline.** New `test-sqlite` job runs the full handler
  integration test suite and store tests against an embedded SQLite
  database. Parallel with the existing Postgres test job. Build gate
  verifies `CGO_ENABLED=0` compilation.
- **Generic provider test config.** Live provider integration tests now
  read `PROVIDER`, `PROVIDER_KEY`, and `PROVIDER_URL` environment
  variables instead of hardcoded `VENICE_API_KEY`. Legacy fallback
  preserved. Model selection prefers non-reasoning models to avoid
  thinking budget requirements with low `max_tokens`.

### Changed
- `kb_chunks` table in SQLite schema includes `embedding TEXT` column
  for JSON-encoded float64 vectors (previously omitted as feature-gated).
- `SimilaritySearch` on SQLite loads candidate chunks, decodes JSON
  embeddings, and computes cosine distance in Go — replacing the
  previous "not available" error.
- `InsertChunks` on SQLite now stores embedding vectors as JSON text.
- Live test names genericized: `TestLive_Venice*` → `TestLive_*`.
- CI `build-and-deploy` depends on `[test, test-frontend, test-sqlite]`.

### Fixed
- **SQLite `RETURNING` + `time.Time` scan failure.** The modernc/sqlite
  driver cannot scan `datetime('now')` TEXT columns into `time.Time` via
  `RETURNING`. All 13 SQLite store `Create` methods rewritten to set
  timestamps in Go (`time.Now().UTC()`) and use `ExecContext` instead of
  `QueryRowContext(...).Scan()`. Format: `2006-01-02 15:04:05` (`timeFmt`
  constant in `helpers.go`).
- **SQLite missing `id` in INSERTs.** Unlike Postgres (`DEFAULT
  gen_random_uuid()`), SQLite `TEXT PRIMARY KEY` columns have no
  auto-generation. Added `store.NewID()` / `uuid.New()` to: `usage_log`,
  `model_pricing` (both upsert paths), `team_members` (AddMember),
  `group_members` (AddMember), `refresh_tokens` (CreateRefreshToken).
- **Test seed helpers SQLite-aware.** `SeedTestUser`, `SeedTestChannel`,
  `SeedTestTeam`, `SeedTestTeamMember`, `SeedTestGroup`, `SeedGroupMember`
  now branch on `IsSQLite()` to provide application-generated UUIDs
  instead of relying on `RETURNING id`.
- **Postgres-isms in SQLite stores.** `extension.go` Update used `now()`
  → `datetime('now')`; `ListForUser` COALESCE used `true` → `1`.
- SQLite store bool/int type mismatches: `persona.go` auto-fetch flag,
  `usage.go` exclude-BYOK filter, `user_settings.go` visibility map
  values — all corrected from `0`/`1` to `false`/`true`.

## [0.17.0] — 2026-02-27

### Added
- **Persona-KB binding.** Personas can now have knowledge bases directly
  bound to them. When a user selects a persona with bound KBs, the
  `kb_search` tool is automatically scoped to those KBs and the persona's
  system prompt includes a KB listing hint. Admin and team admin preset
  forms include a KB picker with per-KB auto-search toggles.
  Migration adds `persona_knowledge_bases` join table.
- **Enterprise KB mode.** New `discoverable` flag on knowledge bases
  controls whether users can see and attach KBs directly. When
  `kb_direct_access` platform policy is set to `true`, users cannot
  attach KBs to channels directly — they access KBs exclusively through
  persona bindings curated by admins. New `ListDiscoverableKBs` and
  `SetDiscoverable` endpoints.
- **Role fallback alerts (issue #69).** When a role's primary provider
  fails and the fallback activates, the resolver emits a `role.fallback`
  event on the EventBus with audit log entry. Admin users see a persistent
  dismissable banner. 5-minute per-role cooldown prevents flooding.
- **Chat rename.** Double-click any chat title in the sidebar to edit
  inline. Enter saves, Escape cancels.
- **Utility model auto-naming.** After the first assistant response,
  a background request to the utility role generates a concise title.
  Falls back to truncation when no utility model is configured.
  New endpoint: `POST /channels/:id/generate-title`.
- **Chat token count.** Conversation token estimate shown in the model
  bar, color-coded against context budget.
- **State restore on refresh.** Active chat ID persisted to
  `sessionStorage`, auto-restored on page reload.

### Fixed
- **ResolvePreset group access bypass.** `ResolvePreset()` used raw SQL
  that skipped `resource_grants` checks from v0.16.0. Now uses
  `PersonaStore.UserCanAccess()`.
- **KB create scope authorization.** Now enforces admin role for global
  KBs and team admin role for team KBs.
- **Completion handler persona ID scoping.** `personaID` variable scoped
  inside an `if` block but referenced downstream. Fixed by threading
  through function signatures.
- **Nil slice JSON marshaling.** `ListDiscoverableKBs` returns `[]`
  instead of `null` when no KBs match.

### Changed
- `UpdateDocumentStorageKey` moved from raw `ExecContext` to store method.
- EventBus route table: `role.fallback` → `DirToClient`.
- Resolver gains `.WithBus(bus)` builder (nil-safe, backwards compatible).
- Service worker: `/extensions/` excluded from fetch handler.
- Mermaid renderer v2.0 (pan/zoom, export) promoted to builtin.
- Removed DIAG diagnostics from `TestGroupBasedPersonaAccess`.
- Paste-to-file threshold synced from backend `PublicSettings`
  (`storage.paste_to_file_chars`, admin-configurable, default 2000).
  Resolves hardcoded constant in `attachments.js`.
- Embedding dropdown already had tolerant type filter, manual model ID
  fallback, and auto-switch on empty — confirmed complete, checkbox updated.

## [0.16.0] — 2026-02-27

### Added
- **User groups.** Global and team-scoped groups decoupled from team
  membership. `groups` and `group_members` tables. Admin and team admin
  CRUD for group management. Groups serve as ACL targets for resources.
- **Resource grants.** Three-way grant model (`team_only`, `global`,
  `groups`) for Personas and Knowledge Bases. `resource_grants` table
  with `grant_scope` and `granted_groups UUID[]` columns. Grant picker
  UI on Persona and KB forms with group multi-select.
- **Schema consolidation.** 9 incremental migrations collapsed into
  single `001_v016_schema.sql`. Fresh installs use the consolidated
  file; upgrade path preserved via migration version tracking.

### Changed
- Persona and KB list queries now filter through `resource_grants` for
  non-admin users. Team-only remains the default scope.
- Admin panel shows group membership counts and grant summaries.

## [0.15.1] — 2026-02-26

### Added
- **`attachment_recall` tool.** Two operations: `list` returns filenames
  and metadata for the current channel's attachments; `read` extracts
  and returns content by attachment ID. Channel-scoped access control.
- **`conversation_search` tool.** Full-text search across the current
  channel's message history using PostgreSQL `plainto_tsquery`. Returns
  matching messages with timestamps and role context.
- **Token estimator attachment awareness.** `Tokens.estimateAttachments()`
  accounts for staged file sizes in context budget calculations. Warning
  thresholds include attachment estimates.

## [0.15.0] — 2026-02-26

### Added
- **Background compaction scanner.** Periodic scan identifies channels
  exceeding configurable context thresholds. Automatic summarization via
  utility role compresses old messages into summary nodes. Per-channel
  opt-in/out via `auto_compact` channel setting.
- **Compaction service.** `compaction.Service` orchestrates summary
  generation: estimates token usage, selects messages for compression,
  calls utility role, inserts summary as tree boundary node with metadata.
- **Context budget guard rail.** 80% ceiling prevents compaction from
  triggering mid-generation. Cooldown timer prevents repeated compaction
  of the same channel.
- **Summarize & Continue button.** User-triggered compaction from the
  context warning bar. Reuses compaction service with immediate execution.

### Changed
- Scanner configurable via `global_settings`: threshold percentage,
  cooldown duration, enabled/disabled toggle. Channel-level overrides.

## [0.14.0] — 2026-02-26

### Added
- **Knowledge bases.** RAG pipeline: upload documents → chunk (recursive
  text splitter) → embed via pgvector → `kb_search` tool for semantic
  retrieval. Team and personal KB scopes. Channel KB toggle enables
  per-conversation knowledge access.
- **Document ingestion.** `knowledge.Ingest()` pipeline: file upload →
  text extraction (reuses v0.12.0 pipeline) → chunking with configurable
  overlap → embedding via the embedding role → storage as `kb_chunks`
  with vector index.
- **KB admin panel.** Knowledge Bases section under AI category. Create,
  delete, upload documents, view chunk counts and storage usage. Team
  admin scoped to team KBs.
- **Notes semantic search.** Note search upgraded from exact text match
  to pgvector cosine similarity when embeddings are available.
- **`kb_search` tool.** Registered when embedding role is configured.
  Accepts query text, returns top-K chunks with source document
  attribution. Channel KB bindings control which KBs are searched.

### Changed
- pgvector extension enabled in schema (`CREATE EXTENSION IF NOT EXISTS
  vector`). `kb_chunks` table includes `embedding vector(1536)` column
  with IVFFlat index.

## [0.13.1] — 2026-02-26

### Added
- **`web_search` tool.** Search provider abstraction with two backends:
  DuckDuckGo (HTML scraping, zero config) and SearXNG (self-hosted,
  JSON API). Returns title, URL, and snippet for each result. Configured
  via `SEARCH_PROVIDER` and `SEARXNG_URL` env vars.
- **`url_fetch` tool.** Fetches and extracts text content from URLs.
  Respects robots.txt. Content-type detection with HTML-to-text
  conversion. Configurable timeout and size limits.
- **Tool categories.** Tools now have a `category` field (builtin,
  search, knowledge, browser). Tools toggle UI in chat bar groups
  by category with per-tool enable/disable.
- **Tools toggle UI.** Popup menu on chat input toolbar showing all
  available tools. Per-tool checkbox state sent as `disabled_tools[]`
  in completion requests. Browser extension tools included.

## [0.13.0] — 2026-02-25

### Changed
- **Admin panel refactor.** Replaced 12-tab modal with fullscreen admin
  panel. Four categories (People, AI, System, Monitoring) with section
  sidebar navigation. URL-based routing (`#admin/people/users`).
  Responsive layout, classification banner-aware positioning.
- **CSS design token cleanup.** Consolidated duplicate color/spacing
  variables. Admin panel uses shared token system with main UI.

## [0.12.0] — 2026-02-25

### Added
- **File handling and vision support.** Upload images, PDFs, and documents
  into chat via 📎 button, drag-and-drop, or paste. Multimodal message
  assembly injects base64 images for vision-capable models and extracted
  text for documents. Staged attachment strip shows upload progress and
  extraction status. Auth-aware blob rendering with Bearer tokens. Image
  lightbox viewer. Vision capability hints on image attachments.
- **Storage backend abstraction.** `ObjectStore` interface with two
  implementations: PVC (local filesystem) for single-node/dev and S3
  (minio-go) for multi-node production. S3 backend works with any
  S3-compatible API: MinIO, Ceph RGW, AWS S3. Auto-detection when
  `STORAGE_BACKEND` is not set (tries PVC, disables if not writable).
  Both backends share identical semantics — all handlers, attachment
  CRUD, multimodal assembly, and orphan cleanup work regardless of
  backend.
- **S3 configuration.** `S3_ENDPOINT`, `S3_BUCKET`, `S3_ACCESS_KEY`,
  `S3_SECRET_KEY`, `S3_REGION`, `S3_PREFIX`, `S3_FORCE_PATH_STYLE` env
  vars. Endpoint auto-detects SSL from scheme. Path-style URLs default
  on (required for MinIO/Ceph). Optional key prefix for shared buckets.
  CI pipeline syncs S3 secrets to K8s when `STORAGE_BACKEND=s3`.
- **Text extraction pipeline.** PDF, DOCX, XLSX, PPTX, ODT, RTF text
  extraction via filesystem-based queue. Inline and sidecar modes.
  Crash recovery for items stuck in processing state.
- **Admin storage panel.** Backend health, file count, total size,
  orphan detection and cleanup. Shows PVC path or S3 endpoint/bucket
  depending on active backend. Extraction queue status.
- **Vault CLI commands.** `switchboard vault rekey` re-encrypts all
  provider API keys when rotating the encryption key.
  `switchboard vault status` shows encryption health. Admin UI
  encryption status indicator in Settings tab.
- **Per-chat model persistence.** Server-side `channels.settings`
  JSONB field stores `last_selector_id`. Roams across devices with
  localStorage write-through cache as fallback.

## [0.11.0] — 2026-02-25

### Added
- **Browser extension system.** Full lifecycle: manifest registration, script
  injection, scoped context (`ctx.renderers`, `ctx.tools`, `ctx.events`,
  `ctx.storage`, `ctx.ui`), permission-aware API proxying. Extensions self-
  register via `Extensions.register()` and receive isolated contexts during
  `initAll()`. Admin CRUD endpoints, asset serving (public, no auth needed
  for `<script>` tag loading), auto-seeder for builtin extensions.
- **Custom renderer pipeline.** Block renderers intercept code fences by
  language tag, post renderers process the DOM after insertion. Case-
  insensitive language matching handles LLM capitalization (`Mermaid`,
  `Diff`, `CSV`). Nested ` ```markdown ``` ` fence unwrapping prevents the
  common LLM pattern of wrapping responses in markdown fences from breaking
  inner code blocks.
- **Browser tool bridge.** Extensions register tool handlers via
  `ctx.tools.handle()`. Server collects browser tool schemas alongside
  server tools, includes them in LLM completions. Tool calls route through
  WebSocket EventBus (`tool.call.*` → browser → `tool.result.*` → server).
  30-second timeout with error recovery.
- **Server tools: calculator and datetime.** Auto-register via `init()`,
  zero wiring changes. Calculator: recursive-descent evaluator with
  arithmetic, 17 math functions, constants. Datetime: current date/time/
  timezone/unix/ISO-week in any IANA timezone.
- **6 built-in browser extensions** (self-contained, own CSS via
  `_injectStyles()`/`destroy()` lifecycle):
  - **Mermaid**: block + post renderer, SVG diagrams, dark mode detection,
    local vendor with CDN fallback, max-height constraint with scroll
  - **KaTeX**: block renderer (` ```latex/math/tex ```) + post renderer
    (inline `$...$` and `$$...$$` in text nodes)
  - **CSV Table**: block renderer, RFC 4180 parser with quoted fields,
    sortable columns (click headers), numeric-aware sorting
  - **Diff Viewer**: block renderer, red/green syntax highlighting for
    unified diffs, stats badge (+N/-N), hunk/file headers
  - **JS Sandbox**: browser tool (`js_eval`), sandboxed iframe
    (`allow-scripts` only), console capture, 10s timeout
  - **Regex Tester**: browser tool (`regex_test`), multi-input matching,
    full match details with named groups and indices
- **Admin extension editor.** Edit button on each extension in Admin →
  Extensions. Inline editor shows name, description, manifest JSON, and
  script source with tab-key support. System extensions show overwrite
  warning.
- **Enhanced diagnostics.** Test 5: browser extensions (loaded, active,
  renderers, tool handlers). Test 6: Service Worker cache (registration,
  scope, state, cache names, entry counts). Purge Cache button in Debug
  Log modal footer.
- **Extension-owned styles.** All 4 rendering extensions (mermaid, katex,
  csv, diff) inject their own `<style>` tags during `init()` and remove
  them during `destroy()`. Global stylesheet only keeps `.ext-rendered`
  wrapper. User-created extensions can bring their own CSS without
  touching the global stylesheet.
- **Notes extension rendering.** `runExtensionPostRender()` called in both
  note read mode and preview mode. Mermaid diagrams and KaTeX math now
  render correctly in notes.
- **Database migration 006_extensions.sql.** `extensions` and
  `extension_user_settings` tables.

### Fixed
- **WebSocket token field mismatch.** API saved `{ accessToken: '...' }`
  but EventBus read `tokens.access`. Tool bridge was dead on arrival.
- **Extension asset 401.** Asset route was behind auth middleware, but
  `<script>` tags don't send Authorization headers. Moved to public group.
- **`runExtensionPostRender is not defined`.** Stale Service Worker cache
  served old `ui-format.js` without the function. Added `typeof` guard.
- **Extension init order.** Extensions loaded after `loadChats()` — block
  renderers not registered when messages first rendered. Moved extension
  loading before chat loading.
- **K8s Ingress WebSocket routing.** Traefik `pathType: Exact` doesn't
  reliably win over `Prefix` rules in the same Ingress resource. Changed
  `/ws` and `/health` to `Prefix` for longest-prefix-wins routing.
- **Mermaid SVG oversized.** Added `max-height: 600px` on diagram
  container with overflow scroll, removed mermaid.js hardcoded `height`
  attribute from SVGs so CSS constraints apply.

### Changed
- Extension CSS removed from global `styles.css`. Each extension owns its
  styles via `_injectStyles()` in `init()` with `destroy()` cleanup.
  Idempotent injection guards prevent duplicates.
- Markdown fence language extraction lowercased at the point of extraction
  in `ui-format.js`, making all block renderer pattern matches
  case-insensitive without per-extension workarounds.
- `_unwrapMarkdownFence()` pre-processor strips outer ` ```markdown ```  `
  wrappers when they contain nested fences. Handles think-block
  placeholders and trailing explanation text. Only triggers when nested
  fences are present — plain markdown code blocks still render normally.

## [0.10.5] — 2026-02-24

### Added
- **`ui-primitives.js` — shared rendering primitives and registries.**
  Single source of truth for provider types, role definitions, and reusable
  UI components. Extension-ready via registry pattern (`Providers.add()`,
  `Roles.add()`). Primitives follow the `renderPresetForm()` pattern:
  `(container, options) → control object` with `getValues/setValues/clear`.
  - `Providers` registry — types, labels, default endpoints (was 5 places → 1)
  - `Roles` registry — names, type filters, hints (was hardcoded in 2 places → 1)
  - `renderCapBadges(caps, opts)` — consolidates 3 badge builders (compact + detailed)
  - `renderProviderForm(container, opts)` — replaces 3 form implementations
  - `renderProviderList(container, opts)` — replaces 3 list renderers
  - `renderRoleConfig(container, opts)` — replaces 2 role UIs + 4 handlers
  - `renderUsageDashboard(container, opts)` — replaces 3 usage renderers

### Fixed
- **Admin provider form now auto-fills endpoint on type change.** Was missing
  from admin (worked in user BYOK and team forms). Now all three scopes use
  the same primitive with identical behavior.
- **Team provider form consolidated.** Was two separate HTML forms (create +
  edit) with separate listeners. Now a single dual-mode form matching the
  pattern used by admin and user BYOK scopes.

### Changed
- Provider type definitions removed from `index.html` (2 static `<select>`s)
  and `settings-handlers.js` (1 dynamic build + 2 endpoint maps). All now
  sourced from `Providers` registry in `ui-primitives.js`.
- Provider list rendering uses event delegation instead of inline `onclick`
  handlers. Each list returns `{ refresh, getCache }` control handles.
- Role configuration uses `data-role-*` attributes for event delegation
  instead of `id`-based selectors and global `onchange` handlers.
- Usage dashboards accept options for compact/full mode, custom API calls,
  and extension-provided extra columns.
- All 16 `confirm()` calls replaced with `showConfirm()` — styled modal
  dialog matching the app design instead of browser-native dialog. Supports
  `danger` styling, Escape/Enter keys, click-outside dismiss.
- Sidebar collapse icon now always visible (dimmed) next to the logo,
  brightens on hover. Previously the icon replaced the logo on hover only.
  When sidebar is collapsed, only the collapse icon shows (logo hidden).
- New `.popup-menu` + `.popup-menu-item` shared CSS base for all dropdown
  and flyout menus. `createPopupMenu(anchor, opts)` primitive available for
  future menu creation with consistent behavior.
- Removed ~360 lines of duplicated code across `admin-handlers.js`,
  `settings-handlers.js`, `ui-admin.js`, and `ui-settings.js`.
- Removed ~40 lines of static HTML form markup from `index.html`.

## [0.10.4] — 2026-02-24

### Added
- **`model_type` field across the full pipeline.** Models now carry a type
  classification (`chat`, `embedding`, `image`) sourced from provider APIs
  at sync time — no hardcoded lists. Venice's `/v1/models` returns `type`
  per model; OpenAI-compatible APIs pass through the field when present.
  - New DB column: `model_catalog.model_type VARCHAR(20) DEFAULT 'chat'`
  - Migration: `005_model_type.sql`
  - Propagation: `providers.Model.Type` → `CatalogSyncEntry.ModelType` →
    `CatalogEntry.ModelType` → `UserModel.ModelType` → frontend `model_type`

### Fixed
- **Admin role save didn't refresh UI.** `adminSaveRole()` showed "✓ Saved"
  but never called `UI.loadAdminRoles()`, so dropdowns appeared stale after
  save. Now reloads the roles panel after a successful save.
- **Role model dropdowns showed all models regardless of type.** Embedding
  role showed chat models, utility role showed embedding models. Both admin
  and user role UIs now filter the model dropdown by `model_type`:
  - "embedding" role → only `model_type === 'embedding'` models
  - "utility" role → only `model_type === 'chat'` models

### Changed
- Venice provider now reads the `type` field from each model in the API
  response and normalizes it (`text` → `chat`, `embedding` → `embedding`,
  `image` → `image`).
- OpenAI provider wire type extended with optional `type` field for
  OpenAI-compatible APIs that include it.

## [0.10.3] — 2026-02-24

### Changed
- **Frontend refactor: 2 monolith files → 13 domain-scoped files.** Split
  `ui.js` (2,582 lines) and `app.js` (2,940 lines) into 13 focused files
  averaging ~544 lines each. No features added, no functions renamed, no
  architectural changes. Vanilla JS, no modules, no build step.

  **New file structure:**

  | File | Lines | Domain |
  |------|------:|--------|
  | ui-format.js | 353 | Markdown rendering, `esc()`, code blocks, side panel |
  | ui-core.js | 974 | UI object: sidebar, chat list, messages, streaming, model selector |
  | ui-settings.js | 640 | Settings tabs, teams, providers, user preferences |
  | ui-admin.js | 645 | Admin tabs, users, roles, usage, teams |
  | tokens.js | 123 | Context tracking, token estimation |
  | notes.js | 364 | Notes panel, editor, multi-select |
  | chat.js | 584 | Chat ops, send, regen, edit, branch, summarize |
  | settings-handlers.js | 692 | Settings save, provider CRUD, command palette |
  | admin-handlers.js | 652 | Admin actions, presets, team management |
  | app.js | 567 | State, init, boot, auth, listener dispatch |

  Unchanged: `api.js` (575), `debug.js` (580), `events.js` (327).

- **`initListeners()` decomposed** into domain-specific init functions:
  `_initChatListeners()`, `_initSettingsListeners()`, `_initAdminListeners()`,
  `_initNotesListeners()`, `_initGlobalKeyboard()`. The orchestrator in `app.js`
  dispatches to each.
- **Side panel resize** changed from self-invoking IIFE to `_initSidePanelResize()`
  called during listener init, avoiding DOM timing issues.
- **Service worker** updated with new file list for pre-caching.
- **Policy-gating tests** updated to read from the correct source files after
  the split. All 159 tests pass.

## [0.10.2] — 2026-02-24

### Added
- **Summarize & Continue** — User-triggered conversation compaction using the
  utility model role. Button appears in context warning bar at ≥75% context
  usage. `POST /channels/:id/summarize` calls the utility role to generate a
  summary, inserts it as a tree node with `metadata.type = "summary"`, and
  updates the cursor. Subsequent completions use the summary as a context
  boundary — messages before it are replaced by the summary as a system message.
  Multiple summaries stack. Fork-aware (summaries are tree nodes with their own
  branch position). "Show full history" toggle reveals collapsed earlier messages.
- **BYOK Role Overrides** — Users with personal providers can override the org's
  utility and embedding model roles. Resolution chain: personal → team → global.
  New "Model Roles" tab in Settings (visible when BYOK is enabled). Stored in
  `user.settings` JSONB under `model_roles` key, same shape as team overrides.
- **Utility Rate Limiting** — `utility_rate_limit` global setting (default: 20
  calls/hour/user, 0 = unlimited). Org-funded utility calls check against
  `usage_log` before executing. BYOK calls exempt (user pays their own way).
  Returns 429 with clear message when exceeded.
- **Message metadata in path** — `PathMessage` now includes `metadata` JSONB
  field, enabling summary detection and future message-type extensibility.
- **Per-chat model/preset restore** — Switching between chats now restores the
  last-used model or preset in the selector. Stored in localStorage keyed by
  channel ID. Falls back to the channel's base model, then the global default,
  if the original selection is no longer available. Cleaned up on chat deletion.

### Changed
- **Generation role removed** — `RoleGeneration` ("generation") removed from
  `ValidRoles` and admin Roles tab. Image/media generation will be
  extension-managed (v0.11.0) with its own provider config, not a role slot.
  The current completion/embedding abstraction doesn't fit image gen's
  fundamentally different API surface.
- **Resolver.Complete/Embed signatures** — Now accept `userID` parameter for
  personal role override resolution. Empty string skips personal lookup.
- **Proactive token refresh** — Access token is now refreshed at 80% of its
  lifetime (~12min for 15min tokens). On page reload, a conservative 60s refresh
  is scheduled since token age is unknown. Eliminates the race condition where
  profile succeeds on a near-expired token but subsequent calls fail.
- **Auth guard in `startApp()`** — If token is invalidated during startup
  (e.g., 401 on loadChats after profile succeeded), app returns to login
  instead of rendering a broken UI with cascading 401 errors.
- **Per-chat model restore fallback** — When the stored model/preset is removed,
  falls back to admin default → first visible model (was keeping stale selection).
  Also cleans up the stale localStorage entry.
- **BYOK Role Overrides** — Fixed response parsing (`configs.configs` not
  `configs.data`) and model field mapping (`configId`/`baseModelId` not
  `provider_config_id`/`model_id`).
- **`GetRole` endpoint integration test** — `GET /admin/roles/:role` now
  exercised by CI via `TestIntegration_Roles_GetSingleRole`, catching the
  `GetConfig` signature mismatch that caused the build failure.
- **Auth resilience frontend tests** — 10 tests covering startup auth guard,
  token refresh lifecycle, and the profile-success-then-401 edge case.
- **JS syntax lint in CI** — `node --check` runs on all `src/js/*.js` files
  before frontend tests, catching parse errors that tests alone can't detect.

## [0.10.1] — 2026-02-24

### Added
- **Admin System Prompt** — Global system prompt configured in Admin › Settings.
  Injected as the first system message in every conversation, before user/preset
  system prompts. Users cannot override or disable it. Stored in
  `global_settings['system_prompt']`.
- **Personas tab** — User presets moved from the Models tab to their own
  "Personas" tab in Settings. Tab is hidden when admin disables user presets
  (`allow_user_personas` policy).
- **Team Management modal** — Team admin functionality extracted from Settings
  into its own tabbed modal (Members, Providers, Presets, Usage, Activity).
  Accessed via "Team Management" flyout menu item, or "Manage →" on team cards
  in Settings. Multi-team admins see a picker first; single-team admins go
  straight to the tabbed view. Back arrow in header returns to picker.
- **Preview pane: clear button** — Trash icon in the preview header resets the
  iframe and shows the empty hint. Also auto-clears when deleting a chat that
  had active preview content.
- **Preview/Notes pane: fullscreen** — Expand button in the header toggles
  fullscreen mode (panel fills entire viewport width).
- **Preview/Notes pane: resizable** — Drag the left edge of the side panel
  to resize (280px–70vw). Width resets on close.
- **Code block: download** — "Download" button on every code block. Infers
  file extension from language tag (e.g. `python` → `.py`, `go` → `.go`).

### Changed
- **Personal Usage scoped to BYOK** — `GET /usage` and the user Usage tab now
  only show consumption against personal (BYOK) providers. Global provider
  usage is the org's cost, not the user's. New `QueryByUserPersonal` store
  method filters on `scope = 'personal' AND owner_id = user_id`. Admin usage
  views remain unaffected. Usage tab hidden when admin disables user providers
  (`allow_user_byok` policy).
- **OpenAI streaming usage race** — Deferred the Done event until the usage
  chunk arrives. Previously, finish_reason fired Done before the usage chunk
  (which has `choices: []`), so streaming token counts were always 0 for all
  OpenAI-compatible providers.

### Fixed
- **Usage logging zero-token guard** — Removed early exit in `logUsage` that
  suppressed rows when tokens were 0. Combined with the streaming race above,
  this meant no streaming usage was ever recorded.
- **Live chat completion test** — `TestLive_VeniceChatCompletion` sent wrong
  field names (`messages`/`config_id` instead of `content`/`provider_config_id`).

## [0.10.0] — 2026-02-24

### Added
- **Model Roles** — Named model slots (`utility`, `embedding`, `generation`)
  with primary + fallback bindings. Stored in `global_settings['model_roles']`.
  Team-level overrides via `teams.settings` JSONB. New `server/roles/` package
  with `Resolver.Complete()` and `Resolver.Embed()` for automatic failover.
  Admin API: `GET/PUT /admin/roles/:role`, `POST /admin/roles/:role/test`.
  Team API: `GET/PUT/DELETE /teams/:id/roles/:role`.
- **Provider Embed() interface** — All providers implement `Embed()`. OpenAI,
  Venice, OpenRouter support `/v1/embeddings`; Anthropic returns `ErrNotSupported`.
  New types: `EmbeddingRequest`, `EmbeddingResponse`.
- **Usage Tracking** — Every completion (streaming and non-streaming) logs
  token counts and cost to `usage_log` table. Cost calculated at insert time
  from `model_pricing` (no retroactive recalculation). Provider scope
  denormalized for efficient admin filtering. Admin views exclude BYOK.
  New stores: `UsageStore`, `PricingStore`. Admin API:
  `GET /admin/usage`, `GET /admin/usage/users/:id`, `GET /admin/usage/teams/:id`.
  User API: `GET /usage` (personal summary).
- **Model Pricing** — `model_pricing` table with catalog sync and manual admin
  overrides. Sync from provider APIs (Venice, OpenRouter) auto-populates
  pricing with `source='catalog'`; manual entries never overwritten. Admin API:
  `GET/PUT/DELETE /admin/pricing`.
- **Streaming token capture** — OpenAI: `stream_options.include_usage` +
  parse usage/cache from final chunk. Anthropic: parse `message_start` for
  input/cache tokens, `message_delta` for output tokens. Cache token fields
  (`CacheCreationTokens`, `CacheReadTokens`) on `CompletionResponse`,
  `StreamEvent`, and `streamResult`.
- **Admin Roles tab** — Configure primary/fallback provider+model per role,
  test-fire from UI.
- **Admin Usage dashboard** — Period selector (7d/30d/90d), group-by
  (model/user/day/provider), totals cards, breakdown table, pricing table.
- **Team Usage dashboard** — Team admins can view usage against their
  team-owned providers via `GET /teams/:teamId/usage`. Filters to
  `provider_configs WHERE scope='team' AND owner_id=teamId`. Integrated
  into team management panel with period/group-by selectors.
- **Admin Reset Password** — Button in user list with vault destruction
  warning dialog (two-step confirmation).
- **User Usage tab** — Settings modal "Usage" tab shows personal token
  consumption and estimated costs across all conversations, including BYOK.
  Period selector (7d/30d/90d) and group-by (model/day).
- **Live Venice integration tests** — Gated behind `VENICE_API_KEY` env var.
  Tests: non-streaming completion, streaming completion, usage logging for
  both modes, pricing from catalog sync, and direct embeddings via BGE-M3.
  Uses `qwen3-4b` (Venice Small) — cheapest at $0.05/$0.15 per 1M tokens.
- **Migration 004** — `usage_log` table, `model_pricing` table, `model_roles`
  seed in `global_settings`.

### Fixed
- **UEK re-wrap on password change** — `ChangePassword` now decrypts UEK
  with old password and re-encrypts with new password + fresh salt. Previously,
  password changes silently broke all personal BYOK keys.
- **UEK destruction on admin password reset** — `ResetPassword` now nullifies
  vault columns, evicts UEK from cache, deletes personal provider configs,
  and logs an audit event. Previously, admin resets left orphaned encrypted
  UEK that silently broke personal keys.
- **Streaming completions logged zero tokens** — `StreamEvent` lacked token
  fields and providers discarded usage data from final chunks. Both OpenAI
  and Anthropic streaming parsers now capture and propagate token counts.
- **OpenAI streaming usage race condition** — The OpenAI protocol sends
  chunks in order: content → finish_reason → usage → [DONE]. The parser
  sent `Done=true` on the finish_reason chunk (step 2) before the usage
  chunk arrived (step 3, with `choices:[]`). The receiver returned
  immediately on Done, so usage was captured but never delivered.
  Fix: defer the Done event as `pendingFinish` until the usage chunk
  arrives, then flush with tokens attached. Tool-call finishes flush
  immediately (tool loop needs the event). Affects all OpenAI-compatible
  providers (OpenAI, Venice, OpenRouter).
- **Token accumulation across tool iterations** — `streamResult` in
  `stream_loop.go` now accumulates input/output/cache tokens across
  multi-tool-call iterations instead of only capturing the final iteration.
- **Admin pricing leaked BYOK entries** — `PricingStore.List()` returned
  all model_pricing rows including those from personal BYOK providers.
  Admin panel showed pricing entries for user-private providers they
  shouldn't see, with O(users × models) scale explosion. Now joins on
  `provider_configs` and filters `scope != 'personal'`. Admin `UpsertPricing`
  also validates provider scope, rejecting manual pricing on personal
  providers.
- **Team role handlers used wrong param name** — `ListTeamRoles`,
  `UpdateTeamRole`, `DeleteTeamRole` read `c.Param("id")` but routes use
  `:teamId`. Every team role operation silently got an empty team ID.
- **Usage logging suppressed for zero-token streams** — `logUsage` had an
  early exit when `inputTokens == 0 && outputTokens == 0`. Combined with the
  OpenAI streaming parser bug (below), this silently dropped all streaming
  usage rows. Removed the guard — requests are always recorded.
- **Live chat completion test used wrong field names** — `TestLive_VeniceChatCompletion`
  sent `messages` and `config_id` but the handler expects `content` and
  `provider_config_id`. Test silently skipped on the binding error.

## [0.9.4] — 2026-02-24

### Added
- **API key encryption (vault)** — Two-tier AES-256-GCM encryption for stored
  API keys. Global/team keys encrypted with env-var-derived key (HKDF-SHA256);
  personal BYOK keys encrypted with per-user encryption key (UEK) derived from
  password via Argon2id. Admin cannot recover personal keys without user's
  passphrase. New `server/crypto/` package: `vault.go`, `cache.go`,
  `resolver.go`, `backfill.go` with 11 round-trip tests.
- **UEK lifecycle** — UEK generated on registration, unwrapped on login
  (Argon2id → AES-GCM), cached in `sync.Map` for session duration, evicted
  with memory zeroing on logout. Pre-migration users auto-initialize vault
  on first login.
- **Migration 003_vault.sql** — Adds `encrypted_uek`, `uek_salt`, `uek_nonce`,
  `vault_set` to users table. Adds `api_key_enc` (BYTEA), `key_nonce`,
  `key_scope` to provider_configs. Backfills `key_scope` from existing scope.
- **Startup backfill** — `BackfillEncryptedKeys()` encrypts plaintext API keys
  on first startup with `ENCRYPTION_KEY` set. `EnforceEncryptionKey()` refuses
  startup if encrypted keys exist but env var is missing.
- **CI/CD: encryption secret** — `ENCRYPTION_KEY` Gitea secret synced to k8s
  `switchboard-encryption` secret. Backend manifest references it as optional
  `secretKeyRef`.

### Fixed
- **HTML code blocks render live in chat (XSS)** — When a model's `</think>`
  tag directly abutted a code fence (no newline), the fence wasn't recognized
  by marked.js, causing raw HTML to render as live DOM elements (canvas games,
  styles, etc.). Three-layer fix: (1) DOMPurify switched from permissive
  `ADD_TAGS` (default allows canvas, style, form, etc.) to strict
  `ALLOWED_TAGS` allowlist of only markdown-produced elements; (2) think-block
  placeholders padded with `\n\n` to ensure adjacent fences start on fresh
  lines; (3) unclosed code fences auto-closed before `marked.parse` for
  streaming protection.

## [0.9.3] — 2026-02-23

### Changed
- **Code blocks: button-driven collapse** — Replaced `<details>` wrapper with
  inline collapse/expand toggle button in the code toolbar. Auto-collapses at
  >15 lines with a fade mask; toggle available on all blocks >5 lines. User
  can always expand/collapse regardless of threshold. Smooth CSS transition
  instead of native `<details>` jump.
- **Thinking blocks: always visible** — Thinking blocks are always rendered in
  the DOM regardless of the `showThinking` setting. The setting now controls
  whether blocks start expanded (`<details open>`) or collapsed. User can
  always click to toggle. Setting label updated to "Auto-expand thinking blocks".

### Added
- **Admin default model** — New `default_model` policy in Admin → Settings.
  Dropdown populated from enabled models. When a user has no saved selection
  (fresh login, cleared browser) or their saved model is no longer available,
  the admin default is used before falling back to first visible. Resolution
  chain: `localStorage → admin default → first visible`.
- **Reasoning/thinking support for OpenAI-compatible providers** — Models that
  send `reasoning_content` in stream deltas (Grok, DeepSeek, etc.) now have
  thinking blocks streamed live and persisted as `<think>` tags. Renders as
  collapsible thinking blocks in both streaming and history views.
- **Favicon animation during generation** — Browser tab favicon pulses with
  cascading dot opacity animation while a completion is in progress, restoring
  to the static favicon when done.
- **Tool calls in message history** — Tool call metadata (name, arguments,
  result, error status) is now persisted alongside assistant messages in the
  database. History view renders tool calls as collapsed `<details>` blocks
  showing "🔧 tool_name → done" with expandable input/output JSON.
- **Notes tool: "View note" link** — When a notes tool (`note_create`,
  `note_update`, etc.) completes, a "📝 View note" button appears in both
  the live streaming tool indicator and the history tool call block. Clicking
  opens the Notes panel and navigates directly to the note.
- **Notes panel: Copy button** — "Copy" button added to note read mode,
  copies title + content as markdown to clipboard.
- **Brand hover: jitter-free crossfade** — Sidebar brand logo→collapse icon
  swap uses opacity crossfade instead of `display: none` toggle, eliminating
  layout reflow jitter on hover.

### Fixed
- **Model selector shows unavailable model** — Selector restoration searched
  all models including user-hidden ones. Saved selection (localStorage) for a
  hidden model like Claude Opus would re-select it on every page load even when
  only Grok was visible. Resolution now filters to visible models only.
- **Refresh toast shows wrong count** — "Loaded 33 models" counted all models
  including hidden; now shows only visible count ("Loaded 1 model").
- **Tool calls vanish after completion** — Live streaming tool indicators
  disappeared when `reloadActivePath()` rebuilt messages from DB. Fixed: the
  `getActivePath` query now includes `tool_calls` column, and `PathMessage`
  carries the data through to the frontend renderer.
- **Tool result "undefined results" text** — Operator precedence bug in tool
  result summary parser caused `undefined results` to display for note_create.
  Fixed summary logic to properly branch on title vs count.
- **Regenerate streams at wrong position** — Regen'd response appeared below
  the full conversation (appended at bottom) then snapped to correct position
  after completion. Fixed: display is now truncated to the parent message
  before streaming starts, so the new response streams in-place as a clean
  branch. Backend context was already correct (excludes old response).
- **Regenerate loses tools, reasoning, and tool execution** — Regen handler
  was a stripped-down copy of the completion handler missing tool definitions,
  tool execution loop, reasoning_content forwarding, and tool_calls persistence.
  Model lost access to note tools on regen and fell back to generic capabilities.
  Refactored: extracted `streamWithToolLoop()` into `stream_loop.go` as the
  single canonical streaming implementation. Both `streamCompletion` (normal
  chat) and `Regenerate` now call the shared function — only persistence
  differs. Future streaming features (new event types, tool capabilities)
  automatically apply to all code paths.
- **OpenRouter free models crash** — Free models with nil pricing caused
  `pq: invalid input syntax for type json` on catalog sync. Nil pricing now
  routes through `ToJSON()` producing `"{}"` instead of nil `[]byte`.
- **API key appears unsaved** — `ListGlobalConfigs` returned raw
  `ProviderConfig` structs where `APIKeyEnc` is `json:"-"` (never serialized),
  so `has_key` was always `undefined`. Now returns computed `has_key` field.
- **Case-insensitive usernames** — Login, registration, and all user lookups
  use `LOWER()` in SQL. All user creation paths normalize to lowercase.
  New migration `002_ci_username.sql` adds `LOWER()` unique indexes and
  normalizes existing rows.

## [0.9.2] — 2026-02-23

### Added
- **Collapsible code blocks**: Code blocks over 15 lines auto-collapse into
  `<details>` with language and line count summary. Language label shown in
  top-left corner of all code blocks.
- **HTML preview**: "Preview" button on HTML code blocks opens a sandboxed
  iframe (`allow-scripts`, no `allow-same-origin`). Auto-detected for
  untagged blocks via heuristic.
- **Token count estimate**: Live token counter below input area showing
  approximate tokens and context usage percentage when model has `max_context`.
- **Context length warning**: Dismissable banner above input at 75% (yellow)
  and 90% (red) context usage with guidance to start a new chat.
- **Proxy interception detection**: `_parseJSON()` checks Content-Type before
  `.json()` on all API paths including streaming. Typed `proxyBlocked` errors
  with proxy page title extraction and actionable splash messages.
- **Environment injection**: `window.__ENV__` wired through entrypoint, k8s,
  and index.html for dev/test/production gating.
- **Enhanced diagnostics**: `NET:PROXY` log type, Content-Type capture in
  fetch interceptor, environment info in export header and state snapshot.
- **Team admin audit scoping**: New `GET /api/v1/teams/:teamId/audit` and
  `/audit/actions` endpoints scoped to team members. Activity Log section
  in team manage panel with filter dropdown and pagination.
- **New favicon**: Switchboard panel design with provider-colored jacks.
  Animated SVG (rotating plugs), 32px PNG, 256px PNG, and ICO.
- **Seed users** (dev/test only): `SEED_USERS=user:pass:role,...` env var
  pre-creates active users on startup. Ignored in production. K8s secret
  `switchboard-seed-users` wired in backend manifest.

## [0.9.1] — 2026-02-23

### Removed
- **Static known model table**: Deleted `knownModels` map from backend and
  `KNOWN_MODELS` from frontend. The same model ID can have different capabilities
  depending on the provider (e.g. DeepSeek has tool_calling on OpenRouter but
  not on Venice). A hardcoded table can't represent this.
- **Frontend `lookupKnownCaps()`**: Removed client-side capability guessing.
  Backend is the sole source of truth via catalog → heuristic chain.

### Changed
- **Resolution chain simplified**: catalog (provider API sync) → heuristic inference.
  No intermediate known table. Providers that report capabilities via API are
  authoritative; heuristics are best-effort for unsynced models.
- **All providers updated**: OpenAI, OpenRouter, Anthropic, Venice now call
  `InferCapabilities()` directly instead of the dead known table lookup.
- **Frontend `resolveCapabilities()`**: Now passes through backend caps as-is.
  No client-side merging with a static table.
- [x] EXTENSIONS.md recovered into repo, updated with Appendix A (Custom
  Renderers) and Appendix B (Model Roles with utility/embedding/generation slots)
- [x] ROADMAP.md restructured: extension foundation pulled to v0.11.0,
  model roles to v0.10.0, dependency graph, TBD replaces post-1.0,
  removed v0.8→v0.9 migration (OBE — no public release, no test path)

### Added
- **Heuristic patterns**: Updated to detect qwen3, gpt-5, grok, kimi, minimax,
  glm-5, gemma-3 model families. Vision expanded to claude-opus/sonnet (not
  just claude-3). Reasoning expanded for thinking, grok, glm patterns.

### Fixed
- **Preset capability pills**: Presets with auto-resolve (no `provider_config_id`)
  now inherit base model capabilities via `GetByModelIDAny` catalog fallback.
- **Venice `optimizedForCode`**: Added mapping to `CodeOptimized` capability.
- **CI test stability**: BYOK journey tests use unreachable endpoints so auto-fetch
  doesn't race with simulated data injection.

## [0.9.0] — 2026-02-22

### Added
- **Schema consolidation**: 21 migrations collapsed to single `001_initial.sql`
- **Store layer**: All database access through typed interfaces (no raw SQL in handlers)
- **Persona model**: Trust-boundary model replacing old presets; scoped global/team/personal
- **Capabilities resolver**: Three-tier chain — catalog → known table → heuristic inference
- **Three-state model visibility**: enabled / disabled / team-only
- **BYOK auto-fetch**: Creating a personal provider triggers model discovery from provider API
- **User model refresh**: `POST /api-configs/:id/models/fetch` endpoint + UI button
- **Composite model IDs**: `configId:modelId` format prevents cross-provider collisions
- **Audit log foundation**: All admin operations logged with actor, action, resource
- **Journey integration tests**: API-driven test suite replacing fake-data tests
- **Frontend test suite**: 107 tests, 27 suites validating model processing pipeline
- **Live Venice API test**: Proves real BYOK → auto-fetch → models visible flow

### Fixed
- **API key storage**: `json:"-"` tag on `ProviderConfig.APIKeyEnc` silently dropped
  keys during admin create/update. Fixed with wrapper structs that bypass the tag.
- **NULL model_default scan**: `scanProviders()` crashed on NULL `model_default` column,
  silently hiding all team and BYOK models. Fixed with `sql.NullString`.
- **Nil slice serialization**: Go nil slices serialized as JSON `null` instead of `[]`,
  breaking frontend fallback chains. Fixed with `make([]T, 0)`.
- **Frontend error swallowing**: API responses with `errors` field were silently ignored.

### Changed
- Backward-compatible API routes with v0.8 field name aliases
- User model preferences table (`user_model_settings`)