Catch genai_errors.APIError specifically and extract e.code and e.message
attributes for proper error logging. The generic str(e) was returning empty
strings for Google API errors, making debugging impossible.
- Import google.genai.errors for specific exception handling
- Add APIError catch before generic Exception in generate_content()
- Add APIError catch before generic Exception in generate_contextual_response()
- Properly categorize errors by HTTP code for retry logic (429/500+ retryable)
- Fix time.sleep to await asyncio.sleep in contextual response handler
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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