feat(npc, nav): 17.5 - a person walks by the world's way where it has one (NpcWorld.way: the next corner toward the target, asked every half second, on reaching it or for a new target; the errand begins only at the target itself; the step round and the give-up stay the fallback), way_test round a wall; and ludic.nav reads a mesh file into the shim's own memory and frees it once parsed, so loading a map leaves nothing in Ludic's never-freed heap

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

packages/ludic.npc/defs.ludic

@@ -47,6 +47,11 @@ export property NpcPerson {
   via_on: bool = false         # a step round whatever is in the way
   vx: float = 0.0
   vz: float = 0.0
+  wx: float = 0.0              # the corner of its way it walks to now (NpcWorld.way)
+  wz: float = 0.0
+  wtx: float = 0.0             # the target that corner was asked for: a new target asks again
+  wtz: float = 0.0
+  way_t: float = 0.0           # seconds until it asks the way again
   detours: int = 0
   fails: int = 0
   stall: float = 0.0           # seconds walking without moving