Rewrite NPC plans around the Quaternius base

docs/makehuman-head-review.md

@@ -1,19 +1,19 @@
 # MakeHuman head prototype
 
-Status: **owner-accepted head, assembled prototype, not yet shipped.**
-The owner accepted the basic human head on 2026-11-04. The automated vision gate
+Status: **retained fallback; superseded as the active NPC head by the Quaternius
+base (ADR-0017).** The owner accepted the basic human head on 2026-11-04. The automated vision gate
 still records REJECT on the eye/lid region as deferred polish. The asset is a
-standalone head/neck extracted from the CC0 MakeHuman base in
-`tmp/npc-research/makehuman/base.obj`; the assembled path now adds hair, a hidden
-scalp trim and the procedural body. The 12 shipped GLBs have not been rebuilt
-with it yet.
+standalone head/neck extracted from the CC0 MakeHuman base. The assembled path
+adds hair, a hidden scalp trim and the procedural body. The 12 shipped GLBs have
+not been rebuilt with it, and the Quaternius migration replaces it as the active
+base. The development source files were removed from `tmp/` on 2026-11-05.
 
 ## Asset
 
 - GLB: [`assets/models/blender_src/makehuman_head.glb`](../assets/models/blender_src/makehuman_head.glb)
 - Review sheet: [`blender_previews/sheet_makehuman_head.jpg`](blender_previews/sheet_makehuman_head.jpg)
-- Source workflow (development-only): `tmp/npc-research/build_makehuman_head.py`
-  — extracts the MakeHuman head, cuts it at the neck, keeps the head/eye/mouth
+- Source workflow (development-only, files removed after the Quaternius pivot;
+  retained here as the historical method) — extracts the MakeHuman head, cuts it at the neck, keeps the head/eye/mouth
   components, cuts an almond aperture through a skin eyelid mask, adds recessed
   eyeballs with flat iris/pupil discs, anchors brows to the face surface, renders
   front/three-quarter/profile and exports the standalone GLB.
@@ -53,10 +53,11 @@ with it yet.
 ## Provenance
 
 - Base mesh: MakeHuman / MPFB base, CC0, from the local research set
-  `tmp/npc-research/makehuman/`; see [`CREDITS.md`](../CREDITS.md).
+  (development source files removed after the 2026-11-05 Quaternius pivot); see
+  [`CREDITS.md`](../CREDITS.md).
 - The head is a **derived prototype**, not a shipped NPC. It does not enter
   `assets/models/blender/npc/`, `npc_base`, the runtime `NpcAvatar` path, CI, or
-  a release package until the NPC overhaul plan accepts it.
+  a release package. It is retained as a fallback, not the active NPC base.
 - Source photographs/proportions are not used as textures here; this is a
   geometry-only head built from the researched model data.
 
@@ -123,8 +124,8 @@ than a body-welded seam.
 - The procedural body was narrowed at the neck and shoulders (chest 0.158,
   neck base 0.060, neck top 0.054, shoulder root z 1.345) and its skin decimate
   dropped to 0.21 so all 12 variants fit the 16,000 cap.
-- Local review renders: `tmp/npc-parts/prototype_mh/renders/` (portrait
-  front/three-quarter/profile and full-body front/three-quarter).
+- Local review renders were removed with the 2026-11-05 `tmp/` cleanup; the
+  committed review sheet above is the retained evidence.
 
 ## Deferred polish