docs: add traffic-intelligent routing and Idaho 511 planned features

- Append section 11 (On-Network Traffic Intelligence) to OFFROUTE-ARCHITECTURE.md
- Create navi-feature-ideas.md with planned features:
  - Traffic-aware Valhalla routing via TomTom tiles
  - Idaho 511 incident feed integration
  - ADS-B/AIS tracking
  - TAK Server + EUD integration
  - Native iOS app

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

docs/navi-feature-ideas.md

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+# Navi Feature Ideas
+
+Planned features and enhancements for the Navi navigation platform.
+
+---
+
+## Traffic & Incident Intelligence
+
+### Traffic-Aware Routing
+
+**Status:** Planned (post-Phase O3)
+
+Integrate TomTom traffic data into Valhalla routing calculations:
+
+- TomTom traffic tiles already available at `/api/traffic/*` (visual overlay)
+- Configure Valhalla `traffic_tile_dir` to consume speed data
+- Routes will account for live congestion on segments 2–4 of offroute chain
+- Does not affect wilderness pathfinder (segment 1)
+
+### Idaho 511 Incident Feed
+
+**Status:** Planned (post-Phase O3)
+
+Real-time road closure and incident integration:
+
+- Poll Idaho 511 API every 5–10 minutes
+- Store active incidents in `navi.db` with auto-expiration
+- Display incidents as map overlay (icons/markers)
+- Feed closures to Valhalla as `avoid_locations` for routing
+- Stretch: support other state 511 feeds for cross-state trips
+
+---
+
+## Tracking & Situational Awareness
+
+### ADS-B Aircraft Tracking
+
+**Status:** Planned
+
+Display live aircraft positions from ADS-B receivers:
+
+- Integrate with local ADS-B receiver (dump1090/readsb)
+- Show aircraft positions, altitude, callsign on map
+- Useful for backcountry SAR coordination and general aviation awareness
+
+### AIS Vessel Tracking
+
+**Status:** Planned
+
+Display marine vessel positions:
+
+- Integrate with AIS receiver or feed
+- Show vessel positions, heading, name on map
+- Applicable for coastal/maritime navigation scenarios
+
+---
+
+## TAK Integration
+
+### TAK Server + EUD Integration
+
+**Status:** Planned
+
+Connect Navi to the TAK ecosystem (ATAK, iTAK, WinTAK):
+
+- TAK Server integration for shared situational awareness
+- Push Navi routes to TAK clients as CoT (Cursor on Target)
+- Pull team member positions from TAK into Navi
+- Enable SAR/field team coordination through unified COP
+
+---
+
+## Mobile & Offline
+
+### Native iOS App
+
+**Status:** Planned
+
+Native iOS application for offline-first navigation:
+
+- Full offline map tile access
+- Offline routing with pre-cached Valhalla tiles
+- Integration with Apple Watch for turn-by-turn
+- Meshtastic/LoRa mesh network support for off-grid comms
+
+---
+
+## Notes
+
+- Features above Phase O3 depend on core offroute functionality being complete
+- Traffic and 511 features can be built in parallel
+- TAK integration useful for field coordination but not blocking core nav