5764719375
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>