Session handoff for the next pickup. #176 (purple seam flash) + #177
(stair-room light pop-in) are ONE bug, root-caused to the camera-nearest
MaxGlobalLights=128 snapshot cap evicting in-range lights of visible
cells (Hub = 366 fixtures). Fix deferred to A7 because uncapping exposes
unported per-cell light-reach (through-floor light) + the fixture
falloff-curve misassignment + an unattributed striped-floor artifact.
- New handoff: docs/research/2026-07-06-176-177-handoff-A7-lighting.md
(root cause, why-deferred, the A7 fix order, tooling inventory).
- Roadmap A7 updated: now owns #176/#177; the 'light visibility culling'
hypothesis layer is CONFIRMED (no per-cell insert_light registration);
fixture-curve layer added. Analysis pre-paid.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
