The active-light selection dropped any point light whose range didn't reach the
VIEWER (DistSq > Range^2*slack -> skip). Retail's D3D-style fixed pipeline picks
the 8 NEAREST lights and applies the hard range cutoff PER SURFACE in the shader
(mesh_modern.frag: if (d < range)). The viewer-range candidacy filter suppressed
a torch whenever the player stood outside its range, so a dungeon room with 2227
registered torches lit only the ~1 the player was standing in (activeLights ~= 1,
rest of the room at flat 0.2 ambient = the "lighting off" report). Drop the filter;
take the nearest 8 regardless of viewer range. Removed the now-unused RangeSlack
const; updated the two tests that codified the old filter. Core lighting suite green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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