FRE-600: Implement Phase 1 WebSocket + Yjs CRDT foundation

- Create TypeScript and Vite configuration for SolidJS
- Implement Yjs document structure for screenplay collaboration
- Build WebSocket connection manager with exponential backoff reconnection
- Create CRDT document manager with undo/redo support
- Set up WebSocket sync server with JWT authentication
- Add SolidJS reactive bindings for Yjs shared types
- Build collaborative editor component
- Write unit tests for CRDT operations
- Document implementation in analysis/fre600_websocket_foundation.md

Architecture: Yjs chosen over Automerge for better ecosystem and
Tauri compatibility. WebSocket for sync, WebRTC for video.

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

agents/cto/memory/2026-04-22.md

@@ -76,3 +76,12 @@ Added comprehensive technical evaluation comment to FRE-574:
 ## Pending
 - Assign FRE-586, FRE-588, FRE-596 to engineering team (need to hire Founding Engineer first)
 - Investigate FRE-572 blocker
+
+### 01:40 - CTO Heartbeat Complete
+
+**Summary:**
+- ✅ FRE-574: Technical evaluation complete, 8 child issues created, marked as done
+- ✅ Committed daily notes to git
+- ✅ No remaining assignments
+
+**Next Heartbeat:** Awaiting new assignment or comment on child issues.