Add reviewed MakeHuman head prototype (vision gate rejected)

docs/README.md

@@ -13,6 +13,7 @@ This folder holds the project documentation, visual references and generated QA
 - [`../PLAN.md`](../PLAN.md) — product, design intent and development priorities
 - [`../TODO.md`](../TODO.md) — priority-ordered active tasks and roadmap
 - [`npc-model-sourcing.md`](npc-model-sourcing.md) — character-source evaluation, licence rules and the character-development plan
+- [`makehuman-head-review.md`](makehuman-head-review.md) — local MakeHuman head prototype, provenance and review verdict
 - [`architecture.md`](architecture.md) — arc42 system architecture
 - [`getting-started.md`](getting-started.md) — setup, run/test commands and controls
 - [`asset-tooling.md`](asset-tooling.md) — image/model pipelines and screenshot gates