archy/core/archipelago
Dorian 6c23360522 feat: add per-peer ratchet session manager with disk persistence
- Create mesh/session.rs: SessionManager for Double Ratchet state lifecycle
  - Lazy-loads sessions from disk on first message
  - Saves after every encrypt/decrypt (chain key advancement)
  - Per-DID storage at {data_dir}/ratchet/{sha256(did)}.json
  - Session info API for RPC status reporting
  - Zeroize on drop for all key material
- Tests: store+load roundtrip, encrypt/decrypt through manager, session removal

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-17 01:54:26 +00:00
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