[ Registry ] Recheck authorization on cached resolution - permission changes

[nhatghost]

Description

This PR addresses Issue #3464 by implementing a secure, reactive authorization cache validation mechanism on AgentRegistry to ensure permission changes immediately invalidate cached access results.

Key Enhancements

1. Dynamic Auth Cache Verification: Configured the registry resolve() function to systematically track agent auth versions. Stale or modified permissions now prompt cache eviction and log an audit warning.
2. 2. Granular Auth Auditing: Added self._authorization_audit tracking detailed security events (authorization_denied, cached_resolution_rejected, permissions_updated) while explicitly omitting raw runtime payloads to avoid data leakage.
3. 3. Cache Isolation & Deep Copying: All cache operations systematically employ deepcopy() to prevent in-memory mutation side-effects and guarantee complete thread-safe state isolation.
4. 4. Rigorous Tests: Added tests/test_registry_authorization_cache.py which covers rechecking cached resolution after permission updates, stale entry eviction, and runtime payload omission.
5. 5. Resolved Deadlocks & Windows compatibility: Applied conditional resource imports and reentrant locking (RLock) in metrics to ensure clean local development environments. All unit tests pass cleanly!