Rebuild the foliage with leaf cards: leafier silhouette at two thirds the triangles

MEMORY.md

@@ -130,6 +130,12 @@ canonical implemented-features list in `docs/development-status.md`.
   gear library. The procedural library + MakeHuman head stay in the tree as the tested fallback
   (`build --source procedural`), not in the shipped roster. Silhouette variety is the known
   regression — three meshes for twelve roles — and the modular part library is the `0.9.10` fix.
+- **Foliage is leaf cards, not sphere stacks (2026-11-06):** `_shrub()` is one low-poly inner mass
+  plus 18–53 two-triangle cards scattered on the canopy shell by a jittered Fibonacci sequence, each
+  rotated onto the canopy normal and tilted off it. No alpha texture, so the flat-colour library and
+  the Compatibility renderer are unaffected — and it is ~35 % cheaper than the sphere stack it
+  replaced. If a shrub ever reads as a rock again, the cards were probably rotated to the normal
+  without the random tilt (`spread`).
 - **Roster is eleven outfits over twelve roles (2026-11-06):** hoodie, Casual, Worker, Suit,
   Adventurer, Beach, Casual_2, Farmer, King, Punk (Swat is intaken but unused — it faces Godot −Z and
   every yaw attempt broke the skin: node rotation turns the skin with it, object rotation collapses