feat: add PumpClaw to ecosystem directory

PumpClaw is a free token launcher for AI agents on Base.

- Deploys ERC-20 tokens with instant Uniswap V4 liquidity
- 80% of trading fees go to token creators
- LP locked permanently (no rugs)
- 27+ tokens deployed, 21+ unique creators
- Open-source: https://github.com/clawd800/pumpclaw
- Factory: 0xe5bCa0eDe9208f7Ee7FCAFa0415Ca3DC03e16a90 (verified on Basescan)
- CLI: npx pumpclaw-cli deploy
- Category: AI (purpose-built for AI agent token economies)

Author: clawd800