Habitat -> structural class (open/closed/mixed) + habitat_notes; document Zebra as undifferentiated Plains/Grevy's

Fix cross-date FAIR2 video/session mappings (16/17 Jan clips) in catalogs + labels.csv; refresh habitat coverage

Reference source via FAIR2 eventID (drop local paths); backfill habitat + add habitat_provenance; fix DJI_0004 mapping

Add drone maneuver test-clip library: 41 clips, catalog, dataset card