Add reviewed MakeHuman head prototype (vision gate rejected)

CREDITS.md

@@ -15,6 +15,10 @@ been cleared for public distribution.
 
 ## 3D characters, gear and props
 
+The local MakeHuman head prototype uses the CC0 MakeHuman/MPFB base mesh
+(see [`docs/makehuman-head-review.md`](docs/makehuman-head-review.md)); it is a
+development prototype, not a shipped character.
+
 The character, gear and prop library is generated by project-owned scripts
 (`tools/blender_assets.py`, `tools/npc_pipeline.py`, `tools/model_pipeline.py`)
 using Blender. The `.blend` working sources are developer artifacts and are not
@@ -42,10 +46,10 @@ shipped derivative of CesiumMan or RiggedFigure must keep the attribution above.
 
 ### MakeHuman head source
 
-The decimated head used by the character head prototype is derived from the
-MakeHuman / MPFB base mesh, **CC0** (`assets/models/blender_src/makehuman_head.glb`;
-source `tmp/npc-research/makehuman/base.obj` with its bundled
-`LICENSE.md`/`LICENSE.ASSETS.md`). It is retargeted, decimated and re-weighted by
+The standalone MakeHuman head prototype is derived from the MakeHuman / MPFB base
+mesh, **CC0** (`assets/models/blender_src/makehuman_head.glb`; source
+`tmp/npc-research/makehuman/base.obj` with its bundled
+`LICENSE.md`/`LICENSE.ASSETS.md`). It is cut, retopologised and re-weighted by
 project scripts; the exported character GLBs remain project assets. See ADR-0015
 and `docs/npc-model-sourcing.md`.