CHANGES: - M3.6.3: marked ❌ RETIRED (Obsidian UI replaces CLI corpus management) - M3.6.2: updated to fetch from Obsidian REST API instead of filesystem - ObsidianRefSource: calls /api/vault/listFiles, /api/vault/readFile - Users manage corpus in Obsidian UI (not via CLI) - Rebuild auto-syncs by re-fetching and comparing file SHAs - No separate chunk-level diff CLI needed - Updated INDEX.md: - M3.6.x: 6 tasks → 5 tasks (removed M3.6.3) - Progress: 1 ✅, 0 🟡, 5 ⬜ → 1 ✅, 0 🟡, 4 ⬜ - Total: 71 tasks → 70 tasks - Noted M3.6.3 retirement in board description RATIONALE: - Obsidian is single source of truth (REST API) - Users already use Obsidian UI for vault management - No need for parallel CLI when vault is the interface - M3.6.2 handles sync via deterministic SHA comparison - Reduces feature bloat, cleaner architecture