merge: bring main (A7 lighting Fix A–D + UN-7 + #140 Fix D) into the D.5 branch

Integrates main's 19 commits (A7 outdoor/indoor torch lighting Fix A/B/C/D,
GlobalLightPacker, shader updates, UN-7) under the D.5 toolbar/item-model stack
(D.5.1/D.5.2/D.5.4/D.5.3a). Auto-merged cleanly except docs/ISSUES.md.

Conflict resolved: both lineages used #140 for different issues. Kept main's
#140 = "A7 Fix D" (resolved); renumbered the toolbar/selected-object issue to
#141 (note added; this branch's commits/spec still reference #140 — immutable).
The register auto-merged (AP-46 cites file:line, not #140; UN-7 keeps #140=Fix D).

Build + full suite green on the merged tree (2,713 passed / 4 skipped).

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

src/AcDream.App/Rendering/GameWindow.cs

@@ -8121,6 +8121,17 @@ 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);
+            _envCellRenderer?.SetPointSnapshot(Lighting.PointSnapshot);   // A7 Fix D (D-2)
+
             var ubo = AcDream.Core.Lighting.SceneLightingUbo.Build(
                 Lighting, in atmo, camPos, (float)WorldTime.DayFraction);