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

assets/models/blender_src/quaternius/README.md

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+# Quaternius build sources (CC0 1.0)
+
+These are the **build inputs** for the shipped NPC roster, not runtime assets.
+`blender_src/.gdignore` keeps Godot from importing this directory.
+
+Source: Quaternius *Ultimate Modular Characters* and *Ultimate Modular Women*
+(<https://quaternius.com/packs/ultimatemodularcharacters.html>), licence CC0 1.0,
+attribution recorded in the repository `CREDITS.md`.
+
+| File | SHA-256 | Bones | Meshes |
+| --- | --- | --- | --- |
+| `Casual.glb` | `bc2d84fba249ebaa0629cb9d133ad37234196e4b8004aa205a6397abed04e05c` | 62 | 4 skinned + Icosphere helper |
+| `Casual_Hoodie.glb` | `f5b722199f7628b24550989af4230f65d5230727df9c326fd2b3e360effe5249` | 62 | 4 skinned + Icosphere helper |
+| `Worker.glb` | `8d0f454336c2effc5c08f63a177af3a82d1a7af025ca9588b40e4c90c4703534` | 62 | 4 skinned + Icosphere helper |
+
+Each file also carries 24 animation clips; the build exports **no** animation data, so
+the shipped GLBs contain the mesh, the 62-joint skin and the material slots only.
+
+Reproducing the shipped characters:
+
+    flatpak run org.blender.Blender --background \
+      --python "$PWD/tools/blender_assets.py" -- build --only npc
+
+Upstream quirks the build compensates for (see `docs/npc-model-sourcing.md`):
+
+1. every mesh ships a **degenerate UV map** (all loops at `0,0`) with flat-colour
+   materials, so the build Smart-UV-unwraps and repacks before export;
+2. the meshes must be joined **without welding** — `remove_doubles` corrupts the
+   skin weights;
+3. the rest pose is a T-pose, so the arm-down rest is baked by
+   `_bake_quaternius_rest()`;
+4. the upstream material names differ per file, so each source carries a slot map
+   down to the project's five tint slots.