Let NPCs roam as HandleNPCStep does

- Random walks and spins from SpriteMovementData, with random sleeps.
- CanObjectMoveInDirection: side walls, land, objects' current and
  previous tiles, the radius (stored plus one) and the screen edge.
- Objects freeze while text is open and during applymovement, and
  return home when both they and their home leave the object window.
- Wandering positions are not saved; test helpers replan around NPCs.

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

tests/route29.test.ts

@@ -111,6 +111,9 @@ describe.skipIf(!existsSync(romPath))("Route 29 with the local ROM", () => {
       expect(world.notice, world.diagnostic).toBe("");
     };
     crossWest(ROUTE_29);
+    // Route29TuscanyCallback hides Tuscany without the Zephyr Badge, even on
+    // a Tuesday (2026-09-22).
+    expect(world.objects().some((object) => object.id === 8)).toBe(false);
     crossWest("26:3");
     walkTo(world, 17, 8);
     expect(world.move("up")).toBe(true);