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

MEMORY.md

@@ -157,6 +157,10 @@ canonical implemented-features list in `docs/development-status.md`.
   donor material renamed to the freed name lands as `Eye.001` and every `m.name == "Eye"` rule
   silently misses it. Purge the datablocks (`bpy.data.materials.remove(m)` when `m.users == 0`) or
   match on `_base_name()`.
+- **A duplicated detail face has to be offset along its own normal.** Copying the eye quad into a
+  pupil and nudging it in world `-Y` vanished: the eye plane is tilted, so the "front" nudge went
+  backwards and the pupil sat inside the sclera. Offsetting along `face.normal * 0.0032` fixed it.
+  Also scale the depth axis when shrinking a copy, or it flattens onto the parent plane.
 - **Blender node colours are linear; Godot tonemaps them.** A mouth lip at `0.16` linear rendered as
   salmon/mauve. Divide by roughly 3–4 versus the intended sRGB value: the hair uses 0.027 linear,
   the lip 0.055/0.018/0.02.