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## Why ChatGPT credentials can rotate while a remote executor is idle. Registry requests need to follow stored rotations without continuing after logout or switching the executor's identity. Concurrent refreshes must also avoid overwriting newer credentials. ## What changed - Reload and validate ChatGPT credentials before registry requests, pinning the credential mode, account, user, and workspace policy. Reuse cached metadata for unchanged personal access tokens. - Retry registration when temporary credential resolution failures prevent a request from being sent. Bound credential resolution and block reuse of a token generation whose refresh outcome is unknown. - Restrict supported authentication modes before executor startup loads credentials or cloud configuration. - Serialize persistent credential writes across cooperating processes and compare stored credentials before committing refreshed tokens. - Replace `auth.json` atomically so overlapping readers see a complete document, preserving symlink targets and protecting file permissions, including Windows access controls. ## Testing Add coverage for credential rotation, logout, identity changes, cancelled refresh callers, temporary metadata failures, registration retries, concurrent credential writes, and atomic file replacement. GitOrigin-RevId: 6b210944bf8eba2f45bc27113f901d2c3cb06b48