fix(core): improve API response error handling and retry logic

[mattKorwel]

• Always retry on transient network error codes (e.g., ETIMEDOUT, ECONNRESET) regardless of retryFetchErrors setting.
• Update WebFetchTool to use retryWithBackoff for fallback fetch operations to handle rate limits (429) and server errors (500s) robustly.
• Add comprehensive tests for retry logic and WebFetchTool error handling.

[gemini-code-assist[bot]]

Summary of Changes

Hello @mattKorwel, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly improves the reliability of external API calls within the core library by implementing more sophisticated error handling and retry mechanisms. It ensures that critical network failures are always retried and integrates a backoff strategy for various HTTP errors, making the system more resilient to transient issues and external service disruptions.

Highlights

• Enhanced Network Error Retries: Transient network error codes (e.g., ETIMEDOUT, ECONNRESET) will now always trigger a retry, irrespective of the retryFetchErrors configuration setting, ensuring greater resilience against intermittent connectivity issues.
• Robust WebFetchTool Integration: The WebFetchTool has been updated to utilize the retryWithBackoff utility for all its fetch operations, providing a more robust handling of HTTP errors such as rate limits (429) and server errors (500s).
• Comprehensive Test Coverage: New and updated tests have been added to thoroughly validate the improved retry logic and error handling within the WebFetchTool and the retryWithBackoff utility, including specific scenarios for network error codes.

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[github-actions[bot]]

Size Change: +754 B (0%)

Total Size: 21.5 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	21.5 MB	+754 B (0%)
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB	0 B
./bundle/sandbox-macos-permissive-open.sb	890 B	0 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB	0 B
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB	0 B
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB	0 B
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB	0 B

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