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/world-driver.ts

@@ -104,7 +104,8 @@ export function walkTo(
   targetY: number,
   answers: (number | string)[] = [],
 ): string[] {
-  const shown: string[] = [];
+  // Finish anything in progress first, such as the tick after a warp.
+  const shown: string[] = settle(world, answers);
   for (let attempt = 0; attempt < 20; attempt++) {
     let blocked = false;
     for (const direction of findPath(world, targetX, targetY)) {