ludic.wildlife (18.2): a walker a crowd moves

wildlife_set_crowd(a, true) hands a walker to a crowd. Its step no longer moves it, and its want is two fields on it: goal_x / goal_z (the point it heads for or faces) and goal_speed (0 when it stands). A route reads those and hands back where the crowd put it through wildlife_moved(a, x, z, vx, vz). That sets its place, its ground, its heading from its velocity and its prints, and updates its row's columns so the spatial index finds it there. Nothing allocates per animal per frame: the want is the animal's own fields, and moved writes in place. The prints and the turn counters moved to walked.ludic (steer.ludic was at the 100-line limit). crowd_test holds it; with crowd off every old test is unchanged. wildlife 26/26.

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

packages/ludic.wildlife/way.ludic

@@ -6,6 +6,11 @@
 # WL_WAY_EVERY seconds or on reaching the corner; without a path, the straight line as before
 const WL_WAY_EVERY: float = 0.5
 function wl_head(a: WildAnimal, tx: float, tz: float, rate: float, dt: float) -> void {
+  if a.crowd {
+    a.goal_x = tx
+    a.goal_z = tz
+    return
+  }
   a.way_t = a.way_t - dt
   let cx = a.wx - a.x
   let cz = a.wz - a.z