USGS Earthquake Hazards Program adapter:
- Polls GeoJSON feed (all_hour default, configurable)
- Magnitude tier classification (minor/light/moderate/strong/major/great)
- Deduplication via USGS stable event ID
- Region filter via shapely point-in-bbox
- Skips events with null magnitude (quarry blasts, etc.)
Includes comprehensive unit tests.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
