Research NPC model sources and plan 0.11.0 expansion

MEMORY.md

@@ -4,6 +4,17 @@ Session memory for durable decisions, state, and gotchas. Keep concise, remove o
 
 ## Decisions
 
+- **NPC model sourcing research (2026-11-03):** `docs/npc-model-sourcing.md` evaluates
+  Quaternius Ultimate Modular (CC0), Kenney Blocky Characters (CC0), Khronos
+  CesiumMan/RiggedFigure (CC-BY 4.0) and the MakeHuman base mesh (CC0). No download is a
+  drop-in: every source lacks the `npc_base` node, the 13 contract bones and the five tint
+  slots; Quaternius additionally exceeds the vertex budget (10.5k–13k imported) and uses a
+  62-bone T-pose rig, CesiumMan/RiggedFigure are short technical references, and the
+  MakeHuman base is ~19k verts with no rig. Downloaded files stay under
+  `tmp/npc-research/` (gitignored), with SHA-256 provenance in the doc. The direction is
+  pending owner review; default if unreviewed is procedural expansion. Do not commit or
+  ship an external model before the licence/ADR decision.
+
 - **0.10.0 balance protocol:** `docs/balance-acceptance.md` defines targets and
   denominator/cohort rules for the 36 venue/difficulty/phase cells, seeds 1–100,
   access/emergency error rates and matched calm vs emergency-first comparisons.