[Plugin] Spraay — Batch payments for AI agents on Base

[plagtech]

## Spraay Plugin

Enables GAME agents to batch-send ETH and ERC-20 tokens to up to 200 recipients in a single transaction on Base.

### Functions
- `spraay_batch_eth` / `spraay_batch_eth_equal` — Batch ETH sends
- `spraay_batch_erc20` / `spraay_batch_erc20_equal` — Batch token sends  
- `spraay_check_balance` — Pre-flight balance check
- `spraay_estimate_cost` — Cost estimation with fees

### Details
- Contract: [0x1646452F98E36A3c9Cfc3eDD8868221E207B5eEC](https://basescan.org/address/0x1646452F98E36A3c9Cfc3eDD8868221E207B5eEC) (verified)
- ~80% gas savings vs individual transfers
- 0.3% protocol fee
- Supports USDC, DAI, WETH, cbETH, USDbC + any ERC-20
- OpenZeppelin ReentrancyGuard + Pausable

### Links
- Website: https://spraay.app
- Standalone repo: https://github.com/plagtech/spraay-game-plugin