Hipparchus 0.3.0

All eight map models now fetch data end to end.

Added
- Night Lights (VIIRS) map model: single-band nighttime-illumination
  GeoTIFF to iso-radiance contours, configured with HIPPARCHUS_NIGHT_LIGHTS
- Generalised raster contour path (value_layer / value_key / level_count)
  so non-terrain rasters are no longer labelled as terrain
- scripts/clip_pbf.py to clip region .osm.pbf extracts to city size
- Area presets and launch auto-fetch options

Changed
- OSM Local rejects out-of-bbox features before building geometry:
  246s to 71s on a 39 MB extract, identical 97,638 features

Notes
- Rendered RGB night-lights previews saturate across bright city cores;
  use calibrated VNP46A or EOG VNL for real work