Feat/global chat#88
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- Schema migrations and monotonic seq with UNIQUE (session_id, seq) - Per-session append mutex so unrelated sessions skip the global lock - Singleflight cold-open lets distinct sessions call StartChat in parallel - setRehydrationActive store + cache writes share one critical section - SSE hub with per-session subscriber cap and reattach - Idle reaper transitions warm-idle to cold under quota
- /api/chats CRUD + messages, SSE stream, end/reopen/delete - chat_rehydration_complete MCP tool gated on X-CM-Chat-Session - Runner reconciliation on startup syncs tracker against active sessions - Chat live-data fan-out via in-process bus to SSE consumers
- Up to 4 simultaneously open chats with LRU eviction toast - Drag-and-drop from sidebar onto pane drop overlays - Per-pane resize, focus, accent stripe from idColor hash - Tab title stays at ContextMatrix; last_chat_id persisted per pane - Mobile single-pane mode with the full ChatThread header
- markCardStalled validates the card before persisting - TransitionTo and parent auto-transition release writeMu before commit - Multi-step transitions snapshot per iteration with rollback on failure - Async pattern matches the existing applyCardMutation contract
- Architecture sections for chat lifecycle, rehydration, runner bridge - API reference for /api/chats and chat_rehydration_complete - web/CLAUDE.md covers multi-pane layout, LRU, drag-and-drop - Gotchas for SSE Firefox abort, MCP header gating, single-writer SQLite - CLAUDE.md package tree updated for chat, clock, gitsync, refresh
- test-race runs the chat, api, mcp packages with -race - Keeps CI under the timeout budget on the new chat-heavy suite
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