feat: add zerodust skill

[andresdefi]

Summary

• Adds ZeroDust chain exit infrastructure skill
• Sweep 100% of native gas tokens (ETH, BNB, MATIC, etc.) from 25 EVM chains via EIP-7702 sponsored execution, leaving exactly zero balance
• 9 files: SKILL.md (457 lines), 4 examples, troubleshooting, contract addresses, error codes, starter template
• Added to marketplace.json in alphabetical order

Skill Contents

File	Description
SKILL.md	Main reference (457 lines) with "What You Probably Got Wrong", quick start, core concepts, contract addresses, common patterns, error handling, security
examples/check-balances/	SDK and REST API balance checking
examples/sweep-single-chain/	Full sweep flow Arbitrum -> Base
examples/batch-sweep/	Multi-chain batch sweeps with error handling
examples/agent-api/	Agent API registration, single/batch sweep with curl
docs/troubleshooting.md	8 common issues with solutions
resources/contract-addresses.md	All 25 chains with explorer links
resources/error-codes.md	16 error codes with causes and fixes
templates/zerodust-client.ts	Complete runnable starter (~160 lines)

Integration Surfaces

• TypeScript SDK: @zerodust/sdk with ZeroDustAgent for automated sweeps
• REST API: Quote, authorization, sweep, status endpoints
• MCP Server: JSON-RPC 2.0 tools for AI agents
• Agent API: Dedicated endpoints with API keys and batch operations
• ERC-8004: On-chain agent registration on Base

Links

• GitHub: https://github.com/andresdefi/zerodust
• SDK: npm install @zerodust/sdk
• API Docs: https://api.zerodust.xyz/docs
• 25 mainnet chains, 650 cross-chain routes via Gas.zip

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