Implement X mention caching and queue system
- Add since_id-based incremental fetching to avoid rate limits
- Create x_queue/ directory system similar to Bluesky queue
- Track last seen mention ID for efficient polling
- Save mentions as JSON files for async processing
- Add single-pass fetch_and_queue_mentions() function
- Avoid duplicate processing with processed mentions tracking
Usage: python x.py queue (single pass, no loops)
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Co-Authored-By: Claude <noreply@anthropic.com>