- Added AES-GCM cache for at-rest broker snapshots keyed on token, with URL as additional data.
- Added `onSnapshot` hook to RemoteAuthCredentialStore for persisting applied snapshots.
- Exposed cache read/write and TTL defaults through the coding-agent re-exports.
- Added `getAuthBrokerSnapshotCachePath` with `OMP_AUTH_BROKER_SNAPSHOT_CACHE` override.