Re-added system/station/district fields to district.yaml that were
incorrectly removed during Tyre10 cleanup. These carry hierarchical
context (planet, station), not redundant identity. Made canonical_id
optional in schema since it's derived from directory path at load time.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Scaffolds the full content directory structure per D-057 spec:
district-as-atomic-pack layout with Sova Transit as the first
district. Includes 17 NPC stubs, 3 locations, 5 triangles,
9 dialogue pools, 8 monologue pools, routines, 7 factions,
7 knowledge catalogs, 8 enum definitions, and global region.
Implements ticket #385.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>