Task-by-task TDD plan: (1) extract GlobalLightPacker (Core, pure) + test + refactor
WbDrawDispatcher; (2) lock the bake contract via LightBake conformance test on the
captured golden torches; (3) D-1 clamp the point-light sum on its own in
mesh_modern.vert; (4) D-2 EnvCellRenderer binds its own per-cell light set (SSBO 4+5)
via SelectForObject over cell bounds; (5) correct register AP-35 + reconcile Fix B.
Concrete code + exact insertion points; visual verification is the acceptance gate.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
