Complete the overworld foundation

Port forced movement (turn delays, bumps, ice, currents, pits), dynamic
return warps, elevators, Surf, Cut, Strength and cycling rules, working
map blocks with changeblock/changemapblocks, and the remaining NPC
movement types and movement commands.

Add tileset animation from the ROM's command tables, grass sprite
priority and special map palettes; room decorations with ownership, the
bedroom PC and save migration; and Key Items access to the Bicycle.

Fourteen original-engine traces compare positions, facing, actors, event
flags and scripted poses. Tile animation matches original VRAM for four
tilesets, and LoadMapPals matches 192 palette cases. skyfall_top now
keeps the $60 sprite offset its step function leaves behind.

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

tests/quest-browser.spec.ts

@@ -60,6 +60,14 @@ async function drive(page: Page, name = "") {
     } else if (await page.locator("#game-screen").getAttribute("data-activity") !== "idle") {
       await page.clock.runFor(500);
     } else {
+      // A scene script starts a tick after the tick that ends a warp, so a
+      // single idle observation is not the end of the scene.
+      await page.clock.runFor(200);
+      if (
+        (await page.locator("#game-screen").getAttribute("data-activity")) !== "idle" ||
+        (await page.locator("#native-dialogue").isVisible())
+      )
+        continue;
       await expect(page.locator("#game-notice")).toHaveText("");
       return messages.join("\n");
     }