Refine the MakeHuman head (weld lids/brows, add hair cap) and add the user review page

docs/screens/head-review/README.md

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+# Head rework — review page (2026-11-04)
+
+This page is the review checkpoint for the NPC head rework. The goal was to replace the
+sphere-and-floating-primitive face with a head that has real nose / chin / jaw landmarks at
+portrait distance.
+
+## What changed
+
+The original procedural face is a head sphere plus separate nose, mouth, ear and eye primitives.
+The new head uses the **decimated MakeHuman head** (CC0, 1,573 tris) as the base shape and keeps
+the project's separate eyeballs, brow and mouth pieces on top. An AI judge was used to drive the
+decision: it scored the procedural rework at ~3/5 and then picked the MakeHuman head as the
+clearer silhouette.
+
+| | Source | Tris (head) | Read |
+| --- | --- | --- | --- |
+| **Before** | procedural `_face` (sphere + primitives) | ~1,900 | flat face, slit eyes |
+| **After** | MakeHuman head + project eyes/brows/mouth | ~2,180 | nose/chin/jaw landmarks |
+
+## AI-generated target concept
+
+The rework was guided by two generated concept frames (front + profile, `bytedance-seed/seedream-4.5`).
+
+![concept](sheet_concept.jpg)
+
+## 1.85 m comparison (top = current, bottom = new)
+
+Left to right: front, three-quarter, profile.
+
+![1.85 m comparison](sheet_compare_1.85.jpg)
+
+## New head at 1.5 m (portrait)
+
+![1.5 m portrait](sheet_head_1.5.jpg)
+
+## Contract and checks
+
+- `blender_assets.py inspect` on the assembled `npc_casual` with the new head: **14 bones,
+  skinned, no issues**.
+- Source: `assets/models/blender_src/makehuman_head.glb` (CC0, attributed in `CREDITS.md`).
+- Python 167/167, Godot 277/277, `check_docs` OK.
+
+## Remaining polish (known, not blockers)
+
+1. The hair cap still reads as a stepped block instead of hugging the skull.
+2. The brows weld to the face but can read as a slightly separate bar.
+3. The neck underside cap is plain; it is hidden by the body neck in the assembled character.
+
+## Decision needed
+
+Approve or reject the MakeHuman-head direction. If approved, the next step is rolling it into the
+other 11 variants (one asset family at a time) with a before/after sheet per batch, and re-running
+the 24-NPC budget + AO bake.