feat(vehicles): 16 - a horse walks on legs in the game's physics (VehicleLegs): the package keeps its pace, stamina, hay and its refusal of water; the legs meet the ground, its steps and slopes and whatever is in the way, and what they cover along its heading is its speed, so a fence stops it and a trunk it glances pushes it aside. VehicleWorld.blocked is gone; the hire, hay and follow verbs move to keep.ludic

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/ludic.vehicles/keep.ludic

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+# keep.ludic - what a player does with their own between rides: hires it, feeds the horse, lets it
+# wander where it is tied, and what a saved trip says of them
+# hired or rented for the trip
+export function vehicle_own(v: Vehicle) -> void { if v != null { v.owned = true } }
+
+# hay for a horse, up to a full belly
+export function vehicle_feed(vehicles_st: VehiclesState, v: Vehicle, amount: float) -> void {
+  if v == null { return }
+  v.food = Math.min(v.food + amount, 100.0)
+  ve_say(vehicles_st, VEHICLE_FED, v, amount)
+}
+
+# a horse nobody rides goes where its animal goes, round the home it is tied at (home_x, home_z)
+export function vehicle_follow(v: Vehicle, x: float, y: float, z: float, yaw: float) -> void {
+  if v == null or v.rider >= 0 { return }
+  v.x = x
+  v.y = y
+  v.z = z
+  v.yaw = yaw
+  VehicleLegs.stand(v.nid, x, y, z)
+}
+
+# a saved trip's word on this player's own: hired, and how fed
+export function vehicle_restore(vehicles_st: mut VehiclesState, kind: int, owned: bool, food: float) -> void {
+  if kind == VEHICLE_HORSE {
+    vehicles_st.ve_kept_horse = owned
+    vehicles_st.ve_kept_food = food
+  } else { vehicles_st.ve_kept_boat = owned }
+  let v = vehicle_find(vehicles_st, kind)
+  if v != null { ve_apply_kept(vehicles_st, v) }
+}
+
+
+function ve_apply_kept(vehicles_st: VehiclesState, v: Vehicle) -> void {
+  if v.kind == VEHICLE_HORSE {
+    v.owned = vehicles_st.ve_kept_horse
+    v.food = vehicles_st.ve_kept_food
+  } else { v.owned = vehicles_st.ve_kept_boat }
+}