Port the PC and boxes

Read TileCollisionStdScripts from the ROM so the Pokémon Center PC runs
PokemonCenterPC: Bill's PC (deposit, withdraw, release, change and name
boxes), the player's item storage (withdraw, deposit, toss, mail box) and
Oak's Pokédex rating. The house PC now opens the full player's PC menu.

A catch with a full party goes to the current box through SendMonIntoBox;
a full box keeps the ball, and filling it queues Bill's call as a memory
script after the battle. Saves gain boxes, box names and PC items,
migrated by absence.

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

tests/foundation-fixture.ts

@@ -1,10 +1,13 @@
 import { CrystalAssets } from "../src/game/rom/assets";
 import { GameWorld } from "../src/game/world/world";
 import { OW } from "../src/game/world/constants";
+import { generatePartyMon } from "../src/game/party/pokemon";
 
+/** `room` places the player at the bedroom PC or poster, "center" at
+ * Cherrygrove's Pokémon Center PC with two Pokémon; otherwise outdoors. */
 export function foundationFixture(
   assets: CrystalAssets,
-  room: boolean | "poster",
+  room: boolean | "poster" | "center",
 ) {
   const world = new GameWorld(
     assets,
@@ -13,12 +16,34 @@ export function foundationFixture(
   );
   world.state.scenes["24:4"] = 1;
   world.state.bag.keyItems.push(OW.BICYCLE);
+  if (room === "center") {
+    world.state.party = [155, 16].map((species, i) =>
+      generatePartyMon(assets.pokemon, {
+        species,
+        level: 8 - i * 4,
+        item: 0,
+        otId: world.playerId,
+        ot: "CHRIS",
+        dvs: 0x9abc,
+        caughtData: 0,
+      }),
+    );
+    world.state.bag.items = [{ item: 18, quantity: 5 }]; // POTION
+  }
   const save = world.save();
+  const [map, x, y] =
+    room === "center"
+      ? ["26:5", 9, 2]
+      : room === "poster"
+        ? ["24:7", 6, 1]
+        : room
+          ? ["24:7", 2, 2]
+          : ["24:4", 9, 6];
   world.restore({
     ...save,
-    map: room ? "24:7" : "24:4",
-    x: room === "poster" ? 6 : room ? 2 : 9,
-    y: room === "poster" ? 1 : room ? 2 : 6,
+    map,
+    x,
+    y,
     direction: "up",
     objects: [],
   });