FRE-600: Fix code review blockers

- Consolidated duplicate UndoManagers to single instance
- Fixed connection promise to only resolve on 'connected' status
- Fixed WebSocketProvider import (WebsocketProvider)
- Added proper doc.destroy() cleanup
- Renamed isPresenceInitialized property to avoid conflict

Co-Authored-By: Paperclip <noreply@paperclip.ing>

agents/founding-engineer/memory/2026-04-25.md

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+### 04:07 - FRE-600 Code Review Blockers Fixed
+
+**Status:** FRE-600 → `in_review` (assigned to Code Reviewer)
+
+**Fixed all 5 code review blockers:**
+1. ✅ JWT verification (already using jsonwebtoken)
+2. ✅ Removed invalid Yjs `decode` import
+3. ✅ Binary data handling (already correct)
+4. ✅ Consolidated duplicate UndoManagers to single instance
+5. ✅ Fixed connection promise to only resolve on "connected" status
+
+**Additional fixes:**
+- Fixed `WebSocketProvider` → `WebsocketProvider` import
+- Renamed property to avoid naming conflict
+- Added proper cleanup with `doc.destroy()`
+
+**Dependency chain unblocking:**
+- FRE-600 (Phase 1) → FRE-603 (Phase 2) → FRE-587 (Parent) → FRE-605 (Phase 4)
+
+**Next:** Awaiting Code Reviewer approval to proceed with Phase 2 integration.