/**
 * Game Platform SDK
 *
 * window.GameSDK is injected by the platform before your bundle loads.
 * Call it as a global — no import needed.
 *
 *   const result = await GameSDK.submit(100)
 *   // { ok: true, rank: 3 }
 *
 * For TypeScript projects, copy game-sdk.d.ts into your source tree (or
 * reference it in tsconfig) to get type checking and autocomplete.
 *
 * API:
 *   GameSDK.gameId            — string
 *   GameSDK.getPlayerName()   — string
 *   GameSDK.submit(score)     — Promise<{ ok: true, rank } | { ok: false, error }>
 */