Add eye whites and pupils to every base and archive the 0.9.9 milestone

docs/blender-assets.md

@@ -176,6 +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.
 
+**Face detail.** None of the three Quaternius heads ships a mouth or eye whites, so the build adds
+both: `_add_quaternius_mouth()` places a lip block on the measured skin surface, and
+`_add_quaternius_eye_whites()` renames the eye quads to `sclera` and adds a shrunken `pupil` copy in
+front of each. Both are fixed-colour (not tint slots), so they survive the role palettes.
+
 **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