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Abhinav 0f21cb3413 Enforce managed authentication backend settings (#39043)
## What changed

- Add `cli_auth_credentials_store` and `chatgpt_base_url` as exact managed requirements loaded from local requirements configuration.
- Apply these requirements to runtime and bootstrap authentication configuration, overriding user-configured values.
- Expose the managed values through `configRequirements/read` and reject attempts to change them through config write APIs.
- Ignore these local-only authentication requirements in cloud-managed requirement layers.

## Testing

- Cover requirement loading and composition, runtime and bootstrap overrides, app-server responses, and read-only config writes.

GitOrigin-RevId: 8ea9c096386072036ca5441f3d48af8707988a65
2026-08-17 18:35:54 +00:00
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