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.

src/game/world/world.ts

@@ -2446,6 +2446,9 @@ export class GameWorld {
           pokedex: draft.pokedex,
           playerId: this.playerId,
           playerName: this.name,
+          johtoBadges: Array.from({ length: 8 }, (_, bit) =>
+            draft.flags.has(OW.ENGINE_ZEPHYRBADGE + bit) ? 1 << bit : 0,
+          ).reduce((bits, badge) => bits | badge, 0),
           timeOfDay: this.clockTimeOfDay,
           random: () => this.random() & 0xff,
           wild: effect.wild,