Establish the 0.9.4 NPC visual baseline

Add a neutral 48-frame character contact sheet, acceptance criteria and ranked baseline gaps, plus repeatable sheet/comparison tooling. No character GLB or runtime mesh changes.

docs/asset-tooling.md

@@ -213,6 +213,20 @@ and firefighter helmet so the badge clears the jacket and the brim does not sit
 over the eyes; these are `NpcAvatar.GEAR_OFFSETS`, not changes to the gear
 contract.
 
+`capture_npc_baseline.gd` is the 0.9.4 neutral baseline: eight characters ×
+front/three-quarter/profile/back/full-body/crowd = 48 frames with a fixed
+camera, studio lighting and no venue/HUD/animation. The raw PNGs stay in
+`tmp/`; `tools/npc_baseline.py sheet` builds the committed contact sheet, and
+`tools/npc_baseline.py compare --before DIR --after DIR` builds the review
+comparison after a model change. See
+[`npc-visual-review.md`](npc-visual-review.md).
+
+```bash
+godot --path . --script res://src/test/capture_npc_baseline.gd -- \
+  --out=res://tmp/npc-baseline
+python3 tools/npc_baseline.py sheet --dir tmp/npc-baseline
+```
+
 `capture_realism.gd` runs seven stages (day, portrait, evening, late, Joke Shop day, Joke Shop night, studio);
 `--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