/**
 * Game Platform SDK
 *
 * window.GameSDK is injected by the platform before your bundle loads.
 *
 * GameSDK.gameId            — string, this game's id
 * GameSDK.getPlayerName()   — string, current player's display name
 * GameSDK.submit(score)     — Promise<{ ok: true, rank: number } | { ok: false, error: string }>
 */