fix(patch): cherry-pick 2139b12 to release/v0.55.0-preview.1-pr-28716 to patch version v0.55.0-preview.1 and create version 0.55.0-preview.2

[gemini-cli-robot]

This PR automatically cherry-picks commit 2139b12 to patch version v0.55.0-preview.1 in the preview release to create version 0.55.0-preview.2.

[gemini-code-assist]

Summary of Changes

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This pull request updates the model fallback mechanism to improve resilience when encountering capacity exhaustion. By reclassifying specific quota errors as terminal, the system can now trigger an immediate fallback to an alternative model rather than attempting redundant retries on an exhausted resource. This change ensures a more efficient and responsive user experience during high-load scenarios.

Highlights

• Model Fallback Logic: Updated the fallback handler in Task.ts to immediately activate fallback mode and stop the current request upon failure, rather than retrying.
• Error Classification: Enhanced error classification to treat capacity exhaustion errors as terminal, triggering immediate model fallback instead of retrying.
• Logging and Testing: Added debug logging for fallback activation and expanded test coverage for terminal quota errors.

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[gemini-code-assist]

Code Review

This pull request updates the error classification logic for Google API errors to treat model capacity exhaustion as a terminal error (TerminalQuotaError) rather than a retryable one, enabling immediate model fallback. It also updates the experimental agent-to-agent server task fallback handler to activate fallback mode and stop execution instead of retrying. Feedback was provided to pass delaySeconds to the TerminalQuotaError constructor when capacity exhaustion is detected via the error message to preserve any server-specified retry delay.

[github-actions]

Size Change: +638 B (0%)

Total Size: 35.2 MB

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[github-actions]

📊 PR Size: size/M

• Lines changed: 162
• Additions: +128
• Deletions: -34
• Files changed: 5