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>

scripts/check-reference.mjs

@@ -87,6 +87,7 @@ const names = {
   fruitTreeScript: "FruitTreeScript",
   fruitTreeItems: "FruitTreeItems",
   engineFlags: "EngineFlags",
+  spriteMovementData: "SpriteMovementData",
   getCurTreeFruit: "GetCurTreeFruit",
   tryResetFruitTrees: "TryResetFruitTrees",
   checkFruitTree: "CheckFruitTree",
@@ -280,6 +281,8 @@ for (const [, block] of battleConstants.matchAll(/export const \w+ = \{([\s\S]*?
 }
 if (!profile.includes(`allFruitTrees: ${pretConstants.get("ENGINE_ALL_FRUIT_TREES")},`))
   throw new Error("ENGINE_ALL_FRUIT_TREES does not match the reference.");
+if (!profile.includes(`NUM_SPRITEMOVEDATA = ${pretConstants.get("NUM_SPRITEMOVEDATA")};`))
+  throw new Error("NUM_SPRITEMOVEDATA does not match the reference.");
 if (!profile.includes(`NUM_ENGINE_FLAGS = ${pretConstants.get("NUM_ENGINE_FLAGS")};`))
   throw new Error("NUM_ENGINE_FLAGS does not match the reference.");
 const groups = readFileSync(`${root}/data/maps/maps.asm`, "utf8")