Port weather, copying moves, held items and obedience (#28)

Complete the weather, Substitute, Transform, called-move and forced-switch effects. Add held-item behavior, Exp. Share awards and badge-based traded Pokemon obedience, and persist trainer berry consumption.

Validated with 576 passing unit tests and 149 browser tests, native/reference builds, reference/vendor/release checks and 320 Metal Powder emulator comparisons per browser. Smart AI and special balls/battle types remain on #28.

tests/route30.test.ts

@@ -130,7 +130,9 @@ describe.skipIf(!existsSync(romPath))("Route 30 trainers with the local ROM", ()
 
   it("does not re-trigger a refused sighting until the player moves", () => {
     const world = fixture({ x: 1, y: 11, direction: "up" });
-    world.state.party[0].moves = [144, 0, 0, 0]; // Transform is refused
+    // Psywave at level 1 loops forever in the original, so it stays refused.
+    world.state.party[0].level = 1;
+    world.state.party[0].moves = [149, 0, 0, 0];
     world.state.party[0].pp = [10, 0, 0, 0];
     const before = world.save();
     world.move("up");