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

TODO.md

@@ -801,8 +801,9 @@ accepted on 2026-11-06; the review page and its sheets were then retired.
       they clear the 0.228 m hair shell. The cap now reads as a cap and both eyes *and* brows show.
 - [x] Hair poking through head gear: fixed by the same lift + cap/hood scale; the firefighter
       helmet dome covers the hair, and the cap reads as a cap rather than a visor.
-- [ ] The eyes are single-colour quads on every base; a light sclera + pupil texture on the `Eye`
-      slot would finish the face at portrait distance.
+- [x] Eyes now have a sclera and a pupil, done as geometry rather than a texture: the existing eye
+      quads became the light sclera and a shrunken copy pushed along the sclera's own normal became
+      the dark pupil (`_add_quaternius_eye_whites()`). Two extra draw calls per head, no new UV work.
 - [x] Review page re-created for the second pass, then retired after the owner accepted the roster
       (2026-11-06). The durable evidence is `docs/3d-model-review.md`, the measurements in
       `docs/blender-assets.md`, and the `capture_npc_gear.gd` / `capture_npc_baseline.gd` scripts.