Major improvements:
- Add comprehensive logging with @actions/core (info, warning, error, debug)
- Implement retry logic with exponential backoff for all network operations
- Add timeout handling for API calls (2 minute default)
- Improve error handling with specific messages and context
- Add input validation for API keys and PR numbers
- Implement rate limit handling (429 responses)
- Add diff size limits to prevent API token overflow
- Fix flawed markdown escape logic in review posting
- Add progress indicators with core.startGroup/endGroup
- Mask sensitive data (API keys) in logs
- Add unhandled rejection and exception handlers
- Improve git operation error handling and output capture
- Add JSDoc comments for all functions
- Fix npm security vulnerabilities
The action is now much more resilient to:
- Network failures and transient errors
- API rate limiting
- Large diffs
- Timeout issues
- Invalid inputs
Logging improvements provide better visibility into:
- Operation progress and timing
- Retry attempts
- Error context and debugging information
- Resource usage (diff size, review length)
