- Vault key uses Zeroizing<[u8; 32]>, passwords zeroized after use
- vault/credentials Mutex upgraded to tokio::sync::Mutex
- CWD tracker + monitor use CancellationToken for clean shutdown
- Monitor exec_command has 10s timeout, 3-strike dead connection heuristic
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>