Changeset 0.21.2 (#88)

CHANGELOG.md

@@ -2,6 +2,41 @@
 
 All notable changes to Chat Switchboard.
 
+## [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