v0.6.5: Renderer pipeline, docs rewrite, architecture diagrams

Lift block rendering to kernel SDK primitives (sw.renderers + sw.markdown)
so all surfaces share one markdown pipeline. Rewrite docs for external
audience — remove all fork history references. Add Mermaid architecture
diagrams, CONTRIBUTING guide, and extension tutorial.

- sw.renderers SDK module: kernel-level renderer registry
- sw.markdown SDK module: unified marked v16 + DOMPurify pipeline
- Browser extension script loader for renderer injection
- Notes + Docs surfaces migrated to sw.markdown.renderSync()
- 4 renderer extensions rewritten to IIFE + sw.renderers.register()
- 6 Mermaid diagrams in ARCHITECTURE.md
- CONTRIBUTING.md + TUTORIAL-FIRST-EXTENSION.md
- DESIGN-WORKFLOWS.md replaces fork-era design doc
- Surface alias routes removed from main.go
- ICD/SDK runners migrated to /admin/packages/ endpoints
- 13 new renderer tests
- Docs, CHANGELOG, ROADMAP cleaned of fork references

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -2,6 +2,62 @@
 
 All notable changes to Switchboard Core are documented here.
 
+## v0.6.5 — Renderer Pipeline + Docs Rewrite
+
+Lifts block rendering to a kernel SDK primitive so all surfaces share one
+markdown pipeline. Rewrites docs for external audience. Adds CONTRIBUTING
+guide and extension tutorial.
+
+### Added
+
+- **`sw.renderers` SDK module**: Kernel-level renderer registry. Extensions
+  register block renderers (fenced code blocks) and post renderers (DOM
+  post-processing) once; all surfaces consume via `sw.markdown`.
+- **`sw.markdown` SDK module**: Unified markdown rendering via `marked` v16
+  (vendored). Lazy-loads `marked` + DOMPurify. Custom code hook delegates
+  fenced blocks to `sw.renderers`. Wikilink tokenizer (`[[Page Name]]`)
+  built in for all surfaces.
+- **Browser extension script loader**: Server injects `<script>` tags for
+  enabled browser-tier extensions into all pages. Extensions register via
+  `sw:ready` event.
+- **Chat markdown support**: Messages with `content_type: 'markdown'` render
+  via `sw.markdown`. Existing `text` messages stay plain (no behavior change).
+- **Mermaid architecture diagrams**: Six diagrams in `docs/ARCHITECTURE.md`:
+  system overview, request flow, extension lifecycle, realtime events,
+  settings cascade, cluster topology.
+- **`CONTRIBUTING.md`**: Development setup, project structure, test commands,
+  code conventions.
+- **`docs/TUTORIAL-FIRST-EXTENSION.md`**: Step-by-step guide to building and
+  installing a browser extension.
+- **`docs/DESIGN-WORKFLOWS.md`**: Clean workflow system design document.
+- **13 new renderers tests** (`src/js/__tests__/renderers.test.js`).
+
+### Changed
+
+- **Notes surface**: Hand-rolled markdown renderer replaced with
+  `sw.markdown.renderSync()`. Post-renderers (mermaid, katex, etc.) now
+  execute on preview. ~90 lines deleted.
+- **Docs surface**: Hand-rolled markdown renderer replaced with
+  `sw.markdown.renderSync()`. ~160 lines deleted.
+- **4 renderer extensions** (mermaid, katex, csv-table, diff-viewer):
+  Rewritten from dead `Extensions.register()` pattern to IIFE +
+  `sw.renderers.register()` via `sw:ready` event. All rendering logic
+  preserved.
+- **Surface alias routes removed**: Six `/api/v1/admin/surfaces/*` backward
+  compat routes deleted from `main.go`. SDK and ICD runner migrated to
+  canonical `/api/v1/admin/packages/*` endpoints.
+- **Docs rewritten for external audience**: All references to fork history,
+  internal codenames, and pre-fork version numbers removed from docs,
+  CHANGELOG, and ROADMAP.
+
+### Removed
+
+- `docs/DESIGN-WORKFLOW-REDESIGN-0.2.6.md` — replaced by `DESIGN-WORKFLOWS.md`.
+- Hand-rolled markdown renderers in Notes and Docs surfaces.
+- Six `/admin/surfaces/*` API alias routes.
+
+---
+
 ## v0.6.4 — Admin Health/Metrics Tab + Cluster Merge
 
 Structural consolidation: cluster dashboard merges into Admin as a Health tab.
@@ -48,7 +104,7 @@ Comprehensive metrics endpoint for runtime, DB, cluster, and extension stats.
 
 ## v0.6.3 — Dead Code Sweep + Registry Fix
 
-Pre-fork hardening: fix broken registry install, add registry settings UI,
+Hardening: fix broken registry install, add registry settings UI,
 clean up dead code, narrow default bundle.
 
 ### Fixed
@@ -74,10 +130,10 @@ clean up dead code, narrow default bundle.
   unused vendor copies with zero production imports. Removed cache entries
   from `sw.js`.
 - **`dev.html`**: 676-line standalone dev gallery, not referenced by anything.
-- **Pre-fork version comments**: Stripped all chat-switchboard version
-  annotations across ~140 files — standalone comments, inline suffixes,
-  section headers, and config field docs. Reworded to describe features
-  rather than reference pre-fork version numbers.
+- **Stale version comments**: Stripped legacy version annotations across
+  ~140 files — standalone comments, inline suffixes, section headers, and
+  config field docs. Reworded to describe features rather than reference
+  obsolete internal version numbers.
 
 ### Changed
 
@@ -1040,8 +1096,8 @@ Indexes on `folder_id`, `creator_id`, `pinned`, `updated_at`.
 - **Dead `history_mode` in stage UI**: Removed history mode selector and state
   from StageForm. Backend column retained for v0.3.x schema migration.
 - **Dead ICD tests**: Removed assertions for `/teams/:teamId/personas`,
-  `/teams/:teamId/providers`, and `/teams/:teamId/models` — endpoints were
-  removed in Phase 0 fork.
+  `/teams/:teamId/providers`, and `/teams/:teamId/models` — endpoints no
+  longer exist in the kernel.
 - **Stale `chat_only` stage mode**: Frontend `STAGE_MODES` updated from
   `['chat_only', 'form_only', 'form_chat', 'review']` to
   `['form_only', 'form_chat', 'review', 'custom']` matching the backend
@@ -1135,13 +1191,13 @@ Indexes on `folder_id`, `creator_id`, `pinned`, `updated_at`.
   (v0.2.7 admin, v0.2.8 user, v0.2.9 team-admin pass 1).
 - Updated bus doc examples and test labels from `chat.*` to `workflow.*`.
 - Renamed `channel-` prefixed test paths to `test-` in storage tests.
-- Updated doc comments throughout to remove references to gutted surfaces.
+- Updated doc comments throughout to reflect current surface architecture.
 
 ### Removed
 
-- **~500 lines of dead CSS**: Orphaned classes for gutted chat, channel,
-  project, notes, editor-chat, sidebar, and router-picker features from
-  `layout.css` and `surfaces.css`.
+- **~500 lines of dead CSS**: Orphaned classes for removed legacy UI
+  components (chat, channel, project, notes, editor-chat, sidebar,
+  router-picker) from `layout.css` and `surfaces.css`.
 - **Dead Go types**: `Grant` struct (persona-era), `CompositeModelKey` func,
   comment-only stubs for NoteGraph, ProjectChannel, etc.
 - **Dead event code**: `chat.typing.*` / `channel.typing.*` condition in WS
@@ -1177,7 +1233,7 @@ Indexes on `folder_id`, `creator_id`, `pinned`, `updated_at`.
 ### Changed
 
 - **UserMenu**: Surface list now driven entirely by the `/api/v1/surfaces`
-  API. Removed hardcoded Chat, Notes, Projects links (gutted in Phase 0).
+  API. Removed hardcoded surface links; menu is now fully dynamic.
   Core surfaces (Admin, Settings, Team Admin, Workflow) filtered from the
   API list and handled as dedicated menu items with RBAC gating.
 - **Tasks surface**: Replaced custom `.tasks-header` with `sw.shell.Topbar`.
@@ -1328,7 +1384,8 @@ Indexes on `folder_id`, `creator_id`, `pinned`, `updated_at`.
 
 ## [v0.1.0] — 2026-03-26
 
-Forked from chat-switchboard v0.38.5. Gutted to a pure extension platform.
+Initial release. Pure extension platform — kernel provides auth, RBAC,
+storage, and the Starlark sandbox. Everything else is a package.
 
 ### Removed
 
@@ -1364,7 +1421,7 @@ Forked from chat-switchboard v0.38.5. Gutted to a pure extension platform.
 
 ### Changed
 
-- Module renamed: `chat-switchboard` → `switchboard-core`
+- Go module: `switchboard-core`
 - VERSION: `0.1.0`
 - Default DB name: `switchboard_core`
 - Fresh migrations: 9 files × 2 dialects (postgres + sqlite), 27 tables