P2P collaboration: cursors, follow mode, cleanup
- Broadcast cursor position from canvas mouse move via awareness
- Broadcast selection changes via reactive watcher on selectedIds
- Follow mode: click peer avatar to track their viewport (pan + zoom)
- Zoom broadcast via watcher on store.state.zoom, not just mouse move
- Figma-style cursor arrows: colored fill, white border, name pill
- Stale cursor cleanup: removeAwarenessStates on peer leave
- MQTT signaling (replace Nostr), STUN + TURN ICE servers
- Collab constants extracted to src/constants.ts
- crypto.getRandomValues() replaces Math.random() everywhere
- Provide/inject for collab composable (COLLAB_KEY)
- Update README (collab section, tech stack), CHANGELOG, AGENTS.md
- AGENTS.md: release process, CI workflows, documentation guidelines
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