Add an RMCP OAuth credential store adapter - #42384
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## What changed - Add a test-only `CredentialStore` adapter that maps RMCP refreshes onto Codex's pinned OAuth credential backend. - Require refresh transaction guards for mutations, preserve the pinned backend, and update the runtime credential snapshot only after persistence succeeds. - Preserve scopes and token expiry metadata while rejecting credentials that no longer match the connection's client or issuer. ## Testing - Cover guarded save and clear operations, persistence failures, pinned-store read failures, replacement and removal handling, and expiry round trips. GitOrigin-RevId: eb1b98024322c03af94f5ab2e88c7dc4ae54893a
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Add an RMCP OAuth credential store adapter
What changed
CredentialStoreadapter that maps RMCP refreshes onto Codex's pinned OAuth credential backend.Testing