Function createInitialPlayerWallet

createInitialPlayerWallet(input): PlayerWallet
Build a fresh wallet seeded with the DEFAULT_PLAYER_WALLET_BALANCE_USD balance for an unseen player.
Parameters
- input: {
  now: string;
  playerId: string;
  }
  - now: string
  - playerId: string
Returns PlayerWallet
Example
```
const wallet = createInitialPlayerWallet({
  playerId: "player-42",
  now: new Date().toISOString(),
});
// → { playerId: "player-42", balanceUsd: 10, currency: "USD", updatedAt: ... }
```
- Defined in packages/sdk/src/lib/space-content-model.ts:256