Define the measurable face/hands acceptance criteria for the model overhaul

docs/3d-model-review.md

@@ -154,6 +154,53 @@ width scale.
 Each GLB carries a stray 42-vert/80-tri `Icosphere` origin helper that must be dropped before any
 promotion.
 
+## Overhaul acceptance criteria (measurable)
+
+Defined 2026-11-04 for the local part pipeline. A prototype must pass every applicable item
+before it is rolled out to the other variants; the bar is the stylized low-poly target, not
+photorealism.
+
+### Face (one-variant prototype first)
+
+Capture `front` (yaw 0°), `three_quarter` (yaw 35°) and `profile` (yaw 90°) at **1.5 m** and
+**1.85 m** (32° FOV), matching `capture_npc_baseline.gd` (a new 1.5 m portrait capture is added
+for this). Pass conditions:
+
+- **Eyes** — sclera + iris + both lids distinct at 1.85 m; at 1.5 m the iris is a readable dark
+  dot against the white sclera, not a floating oval; no socket ring or lid seam.
+- **Mouth** — the mouth line and lower-lip volume read at both distances; no moustache-like
+  shadow from a floating dark slot.
+- **Nose** — bridge, tip and ala planes read in three-quarter and profile; no nose-wing seam or
+  inverted normal at the base.
+- **Ears** — concha depth + lobe read in profile; not a flat disc.
+- **Jaw/cheek/chin** — front and profile show a jaw transition and cheek/chin planes; no faceted
+  plane seams, inverted normals or z-fighting.
+- **Silhouette** — front/three-quarter/profile agree; face direction is unambiguous.
+- **AO** — the 256² bake stays clean: no recessed crease baking into a dark patch.
+
+### Hands (one-variant prototype first)
+
+Capture an **open palm** and a **relaxed grip** at **0.8 m** (`--view=hand` plus a new grip
+capture). Pass conditions:
+
+- **Open palm** — four fingers and a thumb read as a hand, not a mitten; at least two of the four
+  finger gaps are readable.
+- **Grip** — the palm plus curled fingers silhouette reads; no finger-through-palm clipping.
+- **Gear contact** — phone, cup, clipboard, camera, flashlight, wand and radio contact the palm
+  at 0.8 m with `HAND_ITEM_FORWARD` unchanged; no floating or hand-through-item clipping.
+
+### Contract (both, every prototype)
+
+- 16,000 triangles / 16,000 glTF vertices per character; gear stays at 1,500.
+- Optional extra bones are allowed; the required 13 core bones and their rest positions must not
+  move; the `npc_base` mesh node name and the five tint slots stay unchanged.
+
+### Measurement gates
+
+`blender_assets.py inspect`/`audit`/`fit`, `npc_proportions.py`, the 24-NPC budget, Godot + Python
+tests, the 48-frame baseline and the 96-frame pose/context review all stay authoritative; the new
+face/hands captures are the visual bar for this track.
+
 ## Scorecard skeleton
 
 Verdicts use `qa-review` semantics: **P0** (blocker: wrong scale, broken normals, budget fail),