DrainageBasin gained a territorial_status field, so the Layer-1 golden and the atlas_response msgpack fixture pick it up. Both changes are additive/ representational — basin/attractor/river selection is unchanged. - cascade_golden.rs: pass None dominant_faction; golden rebaked (only "territorial_status": "FrontierUnclaimed" added per basin). - gen_fixtures.rs: set the new field in the atlas_response generator; fixture regenerated. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>