Timmy 1d08779941 Add concurrent geocoding with ThreadPoolExecutor
- Use --workers to set concurrent thread count (default 3)
- Speed up coordinate lookup by ~3x with 3 workers
- Maintain Nominatim rate limiting per thread

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-27 08:52:36 +08:00
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