docs: update project docs for v1.0.0 release

- PROJECT.md: Add peer sync feature description and architecture
- ROADMAP.md: Update to v1.0.0, mark peer sync complete
- TASKS.md: Add peer sync completed tasks, update sprint
- TODO.md: Add multi-scanner section, mark items done
- CHANGELOG.md: Add v0.4.0 (HA) and v1.0.0 (peer sync) entries

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

TODO.md

@@ -1,6 +1,7 @@
 # RF Mapper - TODO / Backlog
 
 **Last Updated:** 2026-02-01
+**Current Version:** v1.0.0
 
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@@ -24,6 +25,23 @@
 
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+## Multi-Scanner / Peer Sync
+
+- [x] Scanner identity configuration
+- [x] Peer registration API
+- [x] Bidirectional device sync
+- [x] Timestamp-based conflict resolution
+- [x] Source scanner tracking for synced devices
+- [x] Peer scanner markers on map
+- [x] Background sync thread
+- [ ] WebSocket real-time sync (instead of polling)
+- [ ] Automatic peer discovery via mDNS/Bonjour
+- [ ] Sync RSSI history for trilateration
+- [ ] Web UI for peer management
+- [ ] Sync conflict resolution UI
+
+---
+
 ## Scanning
 
 - [ ] Support multiple WiFi interfaces
@@ -222,6 +240,10 @@
 - [x] Popup persistence during live updates
 - [x] Manual position override (drag-drop for floor-assigned devices)
 - [x] Home Assistant webhook integration (scan, new device, departure)
+- [x] Multi-scanner peer sync (v1.0.0)
+- [x] Bidirectional device metadata sync
+- [x] Source scanner tracking for synced devices
+- [x] Peer scanner markers on 3D map
 
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