v0.0.38: FC-P4 complete — session versioning, wire envelope, auto-backup
FC-P4-T1: Session State Versioning
- RatchetState serialize/deserialize with [MAGIC:0xFC][VERSION:1][bincode]
- Legacy (raw bincode) still loads — backward compatible
- Client + WASM both use versioned format
- 2 new tests: roundtrip + legacy compat
FC-P4-T2: WireMessage Versioning Envelope
- Format: [WZ magic][version:u8][length:u32 BE][bincode payload]
- Server + client + WASM accept both envelope and legacy on receive
- Client still sends raw bincode (server handles both)
- Future version → "update required" error instead of crash
- 3 new tests: roundtrip, legacy compat, future version rejection
FC-P4-T3: Periodic Auto-Backup
- Every 5 minutes, encrypts sessions+contacts+sender_keys to ~/.warzone/backups/
- HKDF-derived key from seed, ChaCha20-Poly1305 AEAD
- Atomic writes (temp file + rename), rotates to keep last 3
- /backup command for manual trigger
127 tests passing (was 122)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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