Bug: Location-restricted monsters could spawn outside their zone because
the check used player position, but monster spawns 30-60m away.
Fix:
- Calculate spawn position BEFORE filtering eligible monster types
- Check if spawn position is within zone, not player position
- Use OSM tag's configured spawn_radius instead of hardcoded 400m
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>