Backend (6 new RPC endpoints):
- mesh.send-invoice: create Lightning invoice, send bolt11 to mesh peer
- mesh.send-coordinate: send GPS coordinates (integer microdegrees)
- mesh.send-alert: send signed emergency alert (with optional GPS)
- mesh.outbox: list pending store-and-forward messages
- mesh.session-status: get Double Ratchet session info per peer
- mesh.rotate-prekeys: force X3DH prekey rotation
Mock backend: matching dev mode responses for all 6 new endpoints
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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