feat: Phase 10 — EVM NFTs, Privy, Farcaster, Pyth EVM (89 → 93 skills)

[0xinit]

Summary

Phase 10 of CryptoSkills. Adds 4 new skills and updates 3 existing skills, bringing the total from 89 to 93.

New Skills (4)

• evm-nfts — ERC-721/1155 development patterns, OpenZeppelin v5.6.1, Seaport 1.6, minting patterns (allowlist with EIP-712 + nonce/deadline, Dutch auction, commit-reveal), ERC-2981 royalties, security checklist
• privy — Embedded wallet SDK with social auth, React SDK, JWT verification, smart wallet integration. Stripe acquisition context. 2-of-3 SSS + TEE key model
• farcaster — Onchain social protocol, Neynar API v3.131.0, Frames v2 Mini Apps, Snapchain architecture, OP Mainnet registry contracts, HMAC-SHA512 webhook verification
• pyth-evm — Pull oracle for 50+ EVM chains, anti-sandwich patterns (atomic update+read), confidence intervals, Express Relay, per-chain addresses, Hermes API

Existing Skill Updates (3)

• safe — ERC-7579 modular smart accounts enrichment (~75 lines overview + 224-line docs/erc-7579-modules.md). Covers Safe7579 Adapter, module types, registry, 4 attack vectors
• pyth — Frontmatter normalization + EVM cross-reference pointing to pyth-evm skill
• chainlink — Alternative oracles cross-reference pointing to pyth-evm and redstone

File counts

• 41 new files, ~8,100 lines of content
• 10-11 files per new skill (SKILL.md + docs/ + examples/4 + resources/3 + templates/1)
• All SKILL.md between 579-728 lines (within 300-800 limit)
• Registry: 93 skills, 0 validation errors

Category growth

Category	Before	After
NFT & Tokens	1	2
Frontend	1	2
Infrastructure	13	14
Oracles	3	4

Test plan

• npx tsx scripts/build-registry.ts — 93 skills
• npx tsx scripts/validate-marketplace.ts — 0 errors, 0 warnings
• All 4 new skills have complete file structure
• SKILL.md line counts verified (579-728)
• safe SKILL.md at 701 lines (under 800 limit)
• Spot-check code examples for copy-paste readiness
• Verify contract addresses against official docs