- Add `bonuses` config (sideQuest 10%, perGoodSold 2%) to reputation.json
- Implement `Reputation.creditFraction()` with sub-point pending credit that pays out whole points across multiple sales
- Wire GameScene to award the issuer's standing on side-quest claim and on goods sold in the shop
- Serialize/deserialize pending credits through save/load round-trip
- Add tests covering crediting, clamping, home-world pinning, and save round-trip