Swap the full 12-character roster onto the CC0 Quaternius bases

docs/adr/0018-quaternius-stage2-runtime-rig.md

@@ -73,3 +73,24 @@ full source rig.
 Resolved: option 2 (62-joint runtime) is the owner's choice. The first implementation step is
 the `NpcAvatar` bone-map + gear-attach re-derivation, then the slot/AO bake and the 12-variant
 rollout.
+
+## Follow-up decision: full roster swap
+
+- **Date:** 2026-11-05 (owner, at the `0.9.9` face/silhouette gate)
+
+The owner chose **option (a) full swap** from
+[`docs/screens/npc-face-gate/`](../../screens/npc-face-gate/README.md): every roster character
+moves onto the Quaternius base, and the procedural generator plus the MakeHuman head retire to
+the tested fallback rather than staying in the shipped roster.
+
+Scope consequences:
+
+- The shipped roster keeps its twelve public character names and `CHARACTER_POOLS` mapping; the
+  geometry behind them comes from the three CC0 full-body sources already researched
+  (`Casual`, `Casual_Hoodie`, `Worker`), aliased per role.
+- Variety now comes from the five tint slots, the gear library and the per-role outfit rules
+  instead of twelve distinct meshes. Roster silhouettes are therefore *less* varied than the
+  procedural library until the modular part library (hair, outfits) is added — tracked as a
+  `0.9.10` task, not hidden.
+- The procedural library, `_build_body()` and the MakeHuman head stay in the tree and tested as
+  the instant fallback; no MPFB or Stage-1 proportion-warp work reopens.