Update Base Skills

[youssefea]

• New skill: /base - Write, test, and deploy smart contracts on Base using Foundry and CDP SDK
• Secure key management: Uses CDP managed wallets via MPC - agents never access private keys directly, eliminating risk of key leakage
• Minimal SKILL.md: 43-line router that directs to comprehensive reference docs - 8 reference guides: CDP setup, faucet, contract development, testing, deployment, verification, contract interaction, and agent-to-agent patterns
• Agent-to-agent focus: Includes patterns for escrow, payment splitters, and conditional payments - useful when agents negotiate financial agreements programmatically
• Networks: Supports Base Mainnet and Base Sepolia testnet

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Note

Low Risk
Documentation-only changes that add a new skill folder and references, with no executable code paths or runtime behavior changes.

Overview
Adds a fully documented base skill, replacing the prior placeholder with a router-style SKILL.md that points to detailed reference docs for CDP wallet setup, faucet funding, contract development/testing, deployment, verification, contract interaction, and agent-to-agent contract patterns.

Updates README.md to list base as an available skill (instead of planned) and expands the repo structure example to include the new base/references/ documentation set.

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