Bitcoin relay (mesh/bitcoin_relay.rs):
- BlockHeaderCache: stores latest block headers from internet peers for SPV
- RelayTracker: tracks in-flight TX and Lightning relay requests
- Builder functions: block header announcements (Ed25519 signed),
TX relay request/response, Lightning invoice relay/response
- All amounts as u64 sats, never float
- 4 unit tests
Emergency alerts (mesh/alerts.rs):
- AlertConfig: dead man switch settings, GPS, emergency contacts
- DeadManSwitch: background timer, auto-trigger after configurable interval
(default 6h), signed alert broadcast with GPS coordinates
- check_in() resets timer, is_triggered() checks elapsed time
- GPS as integer microdegrees (Coordinate type from message_types)
- Disk persistence for config
- 4 unit tests
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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