Add the optional Forward+ desktop HQ build

Package a Forward+ preset with volumetric fog, SDFGI and a volumetric flashlight
for a separate Linux/Windows Desktop HQ zip. Gate the effects on a real
RenderingDevice, tune LATE fog, and adapt local light falloff for Godot 4.7.
Record the Compatibility/Forward+ A/B captures and metrics, add the artifact to
the build/publish scripts, and keep the default Compatibility/Web path
unchanged. Headless 231/231, Python 87/87; exported HQ binary boots with Vulkan.

docs/asset-tooling.md

@@ -186,7 +186,8 @@ python3 tools/scene_concepts.py realism --run docs/screens/realism/<run> --judge
 ```
 
 `capture_realism.gd` runs six stages (day, portrait, evening, late, Joke Shop, studio);
-`--stages=day,late` limits it while tuning. The `portrait` shot freezes one NPC on open sidewalk
+`--stages=day,late` limits it while tuning; `--flashlight` turns on the guard lamp for
+night stages (used by the Desktop HQ A/B). The `portrait` shot freezes one NPC on open sidewalk
 and frames the face, which is the only capture that can judge avatar detail
 (`--portrait-type=N` picks a role). The texture-adoption run,
 [`docs/screens/realism/2026-11-01-adopt/`](../docs/screens/realism/2026-11-01-adopt/report.md),
@@ -194,7 +195,10 @@ compares the pre-adoption captures with the current build: on the shots both set
 judge's like-for-like means rose on every sub-score (overall 0.8 → 1.0, backdrop 0.6 → 1.6) and
 the Pillow metric gap fell 0.444 → 0.348. The character pass
 ([`2026-11-01-npc/`](../docs/screens/realism/2026-11-01-npc/report.md)) adds the portrait shot and
-records the new faces, hands and sleeve cuffs. The gear-fit run
+records the new faces, hands and sleeve cuffs. The
+Forward+ A/B ([`2026-11-01-forward-plus/`](../docs/screens/realism/2026-11-01-forward-plus/report.md))
+compares the Compatibility entrance with the optional Desktop HQ preset.
+ The gear-fit run
 ([`2026-11-01-gear/`](../docs/screens/realism/2026-11-01-gear/report.md)) checks
 the sunglasses, bag and helmet against measured head/skirt bounds with
 `python3 tools/blender_assets.py fit`; it also fixed the portrait yaw and hid