feat(brain): @mosaic/brain structured data service (#11)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

docs/scratchpads/brain-service.md

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+# Scratchpad: @mosaic/brain Structured Data Service
+
+**Issue:** #10
+**Branch:** feat/brain-service
+**PRD:** jarvis-brain/docs/planning/MOSAIC-BRAIN-MEMORY-PRD.md
+
+## Objective
+
+Implement @mosaic/brain as a Fastify service exposing structured data (tasks, projects, events, missions, etc.) via MCP + REST with JSON file backend.
+
+## Plan
+
+1. [x] Add brain data types to @mosaic/types
+2. [ ] Scaffold packages/brain/ with Fastify + MCP SDK
+3. [ ] Implement JSON file storage adapter with locking
+4. [ ] Implement collections: tasks, projects, events, agents, tickets, appreciations, missions, mission_tasks
+5. [ ] Implement MCP tools (query + mutation + mission)
+6. [ ] Implement REST API (mirrors MCP)
+7. [ ] Bearer token auth middleware
+8. [ ] brain_today computed endpoint
+9. [ ] brain_stale, brain_stats, brain_audit, brain_search, brain_graph
+10. [ ] Dockerfile + docker-compose
+11. [ ] Tests
+12. [ ] Code review
+13. [ ] Commit, push, PR, merge
+
+## Progress
+
+- 2026-03-10: Issue #10 created, branch created, starting implementation
+
+## Risks
+
+- Types package already has `Task`/`TaskStatus`/`TaskPriority` for queue — need namespacing
+- Large implementation surface — focus on core CRUD first, computed endpoints second
+
+## Decisions
+
+- Brain types exported from `@mosaic/types` under `Brain` prefix to avoid queue type conflicts
+- JSON storage uses one file per collection
+- In-memory index rebuilt on startup