Release 0.9.9: full Quaternius roster, docs, changelog, version, slimmer export filters and checksums

docs/blender-assets.md

@@ -142,11 +142,22 @@ render about 2.5 min.
 
 ## Characters
 
-All library variants, including the incoming Quaternius-derived base, share the
+All library variants share the
 [character and gear asset contract](architecture.md#character-and-gear-asset-contract):
-`npc_base` mesh node, required 13 core bones (optional extras allowed), five
-tint slots, +Z visual front, 24,000/24,000 character budget and the same 256²
-slot-map/AO rules. Role selection and look notes:
+`npc_base` mesh node, five tint slots, +Z visual front, 24,000/24,000 character budget and the
+same 256² slot-map/AO rules. The shipped roster is on the 62-joint Quaternius skeleton
+(ADR-0018); the procedural fallback built by `build --source procedural` keeps the 13 core bones.
+Both are accepted by `audit`, `inspect`, the runtime bone map and the tests.
+
+The three Quaternius sources (`casual`, `hoodie`, `worker`) live in
+`assets/models/blender_src/quaternius/` as build inputs. `build` (default
+`--source quaternius`) does a two-pass bake per character: a cached T-pose round trip that joins
+without welding, maps the upstream materials onto the five slots and unwraps the degenerate
+source UVs, then an arm-down rest bake exported with `export_apply=False`. The per-character slot
+map, triangle counts and measurements are in
+[`npc-model-sourcing.md#shipped-roster-099-owner-chose-the-full-swap`](npc-model-sourcing.md#shipped-roster-099-owner-chose-the-full-swap).
+
+Role selection and look notes (tint + gear now carry the role, not the mesh):
 
 | Character | `layer_for()` / look | Suggested roles | Preview gear |
 | --- | --- | --- | --- |
@@ -165,6 +176,11 @@ colour texture. The current `_apply_outfit_materials()` sets
 `albedo_color = WHITE` on any slot it does not recognise, and these keep their
 colour through that. When integrating, tint only the five contract slots.
 
+**Head gear fit.** Head gear is authored for the shipped Quaternius head:
+`HEAD_GEAR_SCALE = 0.64` (0.201 m base head against the 0.315 m procedural one) and
+`HEAD_GEAR_LIFT = 0.07` (its centre sits higher). The procedural fallback therefore wears slightly
+undersized caps — cosmetic and fallback-only.
+
 **Runtime tint notes (implemented).** Only the five contract slots are tinted;
 fixed detail materials keep their authored colour. On `npc_vest` the vest is the
 fixed `hivis` material and `cloth` is the undershirt, so the yellow override is