Metabolism M2.9: flora islands, gardens, walls, farmer strain, aimed work (VM AIM actions), food-limited ecology rebalance

metabolism/EVOLUTION.md

@@ -207,6 +207,48 @@ for 10 s straight; quarries opening with soil and burden appearing; carried
 rock rising as walls. The strips read it directly: grey masses the colonies
 grow around, fronts grinding along them.
 
+### M2.9 — flora, gardens, walls: a world of workable things ✔
+
+After M2.8 the films had stone but nothing to DO with it, and the ecology
+still lived on wells alone. This iteration added the interactable layer —
+items with feedback loops, each needing its own LittleVM instructions, hence
+real specialisation:
+
+- **aimed work** — the VM gained an AIM (two pseudo-actions setting a heading;
+  it defaults to the direction of travel), and every work action lands at the
+  block the agent is FACING, never beneath its feet: masons carve the face of
+  the wall ahead, farmers tend the bed they walk toward, strikers hit where
+  the enemy stands. The work-senses (rock, garden) look where the last aim
+  pointed — sight follows intent.
+- **gardens** — the mason TILLS fresh stone into a cultivated bed (brought to
+  maturity one cell at a time; a dusting of fertility would exhaust as fast
+  as it is laid). A bed yields food slowly for a while, then the spent soil
+  sets back into rock: agriculture slowly eats the world's stone, and the
+  song's rockfalls replenish it. Digging itself yields NO food — stone is for
+  building; food comes from wells, flora, events and gardens.
+- **walls** — the carried burden rises as a wall (pooled per block, mortared
+  along a rounded footprint). Walls block movement, so they defend; enemies
+  strike at their aim target and SAP the stone at the front — sieges happen,
+  and unmaintained walls weather away. The masons are never done.
+- **farmers** — a new strain role: it walks the field rows and TENDS the beds
+  (a tended bed yields up to threefold), opens new beds into fresh stone, and
+  commutes along the garden gradient. Work is foraging: the hungry branches
+  of mason and husbandman work the ground they aim at, because that is where
+  their food comes from.
+- **flora** — the world's pioneers, living in ISLANDS scattered at birth
+  (a dozen small patches; they can never spread beyond their own seed
+  ground). Each stand is food — grazed down by hungry crowds, never wiped out
+  (seed-rain), regrowing slowly. Its vigour tracks the world's famine: a
+  starving or dwindling world blooms with flora and is seeded back to life;
+  a strong, well-fed world grazes it back to a whisper. Rendered as speckles
+  — a few apple trees and bushes here and there, never a garden of Eden.
+
+*Balance notes carved into the tests:* the ecology is food-limited (the gate
+is nearly shut on bare ground; colonies that outgrow their ground starve back
+and wander); rock has a budget that survives a whole film (calm songs keep
+sparse stone, percussive ones accumulate walls); agriculture consumes stone
+instead of minting it. 44 tests green; realtime holds at 640×360.
+
 ### M3 — the lens: travel, don't cut
 Replace the cut-to-a-point grammar with a **move grammar**: *track* (follow a
 moving front), *reveal* (pan along a coastline), *establish* (hold wide and