Add enhanced logging and error handling for Letta API debugging
- Add debug logging configuration with separate INFO level for main logger
- Create queue/errors directory for non-retryable failures
- Enhance error handling to distinguish between retryable (524) and non-retryable (413) errors
- Add detailed logging throughout process_mention for better debugging
- Log agent details including tools on initialization
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Co-Authored-By: Claude <noreply@anthropic.com>