M1d: creatures, hunting, weapons, food buffs and the hide cloak

- Rabbits, deer and boars with procedural meshes and animated legs, a
  state machine (idle/wander/flee/charge/dead) and heightmap steering that
  avoids water, cliffs, the world edge, trees and buildings
- Spawner keeps a habitat-based budget around the player (6/4/3)
- Melee needs a weapon or tool (club, spear, axe, pickaxe); box sweep hits
- Wooden spear (thrust or throw) and crude bow with draw-scaled arrows;
  projectiles stick in the world as saved pickups
- Carcasses: E to butcher for meat, hide and embedded arrows
- Boars charge and gore when hit; hurt flash and a brief healing pause
- Cooked meat gives Well fed (faster stamina and healing); buffs saved
- Hide cloak: wear for warmth, saved, goes in the grave on death
- Feathers as meadow pickups (appended, existing save ids unchanged)
- New test_creatures_combat suite; run_all.sh gets a per-suite time limit

docs/ROADMAP.md

@@ -32,7 +32,8 @@ Detailed plan in `docs/SURVIVAL_DESIGN.md` (phases M1a–M1d).
 - [x] Weather (rain, storm, snow), wet/shelter *(M1c)*
 - [x] Snap-together building: floor/wall/door/roof/gable, resource cost, support + collapse, dismantling *(M1c)*
 - [x] Bed spawn point and sleeping, resource regrowth *(M1c)*
-- [ ] Creatures, hunting, weapons *(M1d)*
+- [x] Creatures (rabbit, deer, boar), hunting, club/spear/bow, butchering, cooked-food buffs, hide cloak *(M1d)*
+- [ ] Wolves at night, hide armour, more recipes *(later M1 polish)*
 - **Done when:** gather → craft → build a tiny shelter, single-player.
 
 ## M2 — Multiplayer · ~2–4 months