- Fix protocol version comment (12 → 13) in ObserverSnapshot doc
- Widen Want intensity range from 3..=9 to 1..=10 to match spec and test
- Replace duplicated pool selection in trigger_recognition_monologue with
call to select_pool_line helper (~50 lines removed)
- Document NaiveSpatialIndex migration cost for grid/quadtree swap
- Remove misleading Default derive from TellCategory (Nervous is not a
sensible default for neutral NPCs)
- Add caller invariant doc on generate_npc (no TilePosition spawned)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Define SpatialIndex trait with entities_in_range, entities_at, and
update methods. NaiveSpatialIndex uses Vec backend with Manhattan
distance. sync_spatial_index system auto-updates from Changed<TilePosition>.
Registered as Bevy resource. Trait abstraction allows grid/quadtree
replacement later without touching callers.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>