Codex Guard 0.6.7 Preview

Unsigned security architecture preview for Windows 10/11 (.NET Framework 4.8). Adds a non-cancellable elevated progress window with current ACL stage/path and elapsed time, while preserving the existing admin-unrestricted actor model. Automated tests: 75 passed, 0 failed. ZIP SHA-256: 350475cff6ff3b97ebe505698f9bce59c3093358b5332bd3dab00b8a329d7886. Verify hashes before running and test on recoverable data first.