fix(render): A7 Fix B — per-OBJECT point-light selection (minimize_object_lighting)

Outdoor objects brightened as the camera approached: lighting selected the
nearest 8 lights to the VIEWER and fed that one global set to everything
(LightManager.Tick), so a building's wall torches only lit it once the camera
got close enough for them to win the global top-8. Probe confirmed the scale of
the problem: a single Holtburg view registers 129 point lights — the global cap
of 8 was hopeless.

Retail selects up to 8 lights PER OBJECT by the object's own position
(minimize_object_lighting 0x0054d480), so a torch always lights the wall it
sits on, camera-independent. Ported faithfully:

- LightManager.SelectForObject (pure, TDD, 8 new tests): candidacy
  (light.pos − center)² < (Range + radius)², nearest-8 among those. Plus
  BuildPointLightSnapshot for the per-frame stable-indexed light list.
- mesh_modern.vert: two SSBOs — binding=4 GLOBAL point-light array (the
  snapshot), binding=5 per-instance light SET (8 int indices into it, -1 =
  unused), parallel to the binding=0 instance buffer (mirrors the U.3 clip-slot
  mechanism). accumulateLights keeps ambient + sun from the SceneLighting UBO
  (cleared as faithful by the lighting audit) and loops THIS instance's point
  lights. pointContribution factored out (same calc_point_light wrap+norm shape).
- WbDrawDispatcher: per-entity light set computed ONCE at the isNewEntity site
  (constant across the entity's parts), by the entity's AABB sphere; threaded
  into grp.LightSets parallel to grp.Matrices; global + per-instance buffers
  uploaded in Phase 5. Camera-independent ⇒ stable for static buildings.
- GameWindow: BuildPointLightSnapshot + dispatcher.SetSceneLights each frame.

Tests: 17/17 LightManager + 36/36 dispatcher clip-slot/clip-frame green
(parallel-array lockstep preserved). Visually gated: the meeting hall now holds
steady as the camera approaches (was the popping symptom).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/AcDream.App/Rendering/GameWindow.cs

@@ -7766,6 +7766,16 @@ public sealed class GameWindow : IDisposable
             // frame — terrain, static mesh, instanced mesh, sky.
             UpdateSunFromSky(kf, playerInsideCell);
             Lighting.Tick(camPos);
+
+            // Fix B (A7 #3): build this frame's point-light snapshot and hand it to
+            // the entity dispatcher for per-OBJECT light selection
+            // (minimize_object_lighting). Replaces the single global nearest-8-to-
+            // camera UBO set for point/spot lights so a wall's torches stay tied to
+            // the wall as the camera moves. The SUN + ambient still flow through the
+            // SceneLighting UBO built below (binding=1) — terrain/sky read those.
+            Lighting.BuildPointLightSnapshot(camPos);
+            _wbDrawDispatcher?.SetSceneLights(Lighting.PointSnapshot);
+
             var ubo = AcDream.Core.Lighting.SceneLightingUbo.Build(
                 Lighting, in atmo, camPos, (float)WorldTime.DayFraction);