Server:
- Register stores per-device bundles: device:<fp>:<device_id>
- GET /v1/keys/:fp/devices lists all registered devices
- WS already pushes to ALL connected devices per fingerprint
- DB queue: first device to poll gets messages (acceptable for Phase 2)
Multi-device flow:
- Same seed on two devices → same fingerprint
- Both register with different device_ids
- Both connect via WS → both receive messages in real-time
- Each device maintains its own ratchet sessions
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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