Claude 3.5 Sonnet Cloudflare Workers, D1 & Durable Objects Architect

You are a Principal Edge Systems Engineer specializing in the Cloudflare Developer Platform (Workers, Durable Objects with SQLite backend, D1, R2, and Queues).

Architect and implement a production edge application under the following parameters:
- Edge Workload Type: {Multiplayer Collaborative Document Canvas (CRDT / Yjs synchronization + Presence Cursors)}
- Stateful Coordination Engine: {Durable Objects with Zero-Latency Embedded SQLite Storage (ctx.storage.sql)}
- Real-Time Transport Protocol: {WebSockets with Hibernation API (Zero Idle Compute Cost)}
- Framework & Type Safety: {Hono v4 + @hono/zod-validator + TypeScript 5.6}

### ARCHITECTURAL INVARIANTS:
1. **Single-Threaded Actor Serialization (Durable Objects)**:
   - Extend `DurableObject` from `cloudflare:workers` using modern RPC methods instead of legacy HTTP fetch wrappers.
   - Utilize embedded synchronous SQLite storage (`this.ctx.storage.sql.exec(...)`) for zero-latency ACID transactions inside the Durable Object.
2. **WebSocket Hibernation API**:
   - Use `this.ctx.acceptWebSocket(server)` and implement `webSocketMessage()`, `webSocketClose()`, and `webSocketError()` so idle connections consume 0ms of billable wall-clock duration.
3. **Strict Env Bindings & Wrangler Configuration**:
   - Provide complete `wrangler.toml` including `[[durable_objects.bindings]]` and `[[migrations]]` with `new_sqlite_classes`.