Enhance CLAUDE.md with comprehensive AI upgrade guidance

[sethconvex]

• Add tool approval flow to Key Patterns architecture section
• Replace upgrade section with detailed AI-friendly guidance including:
  • Detection patterns for v5 code (parameters, handler, textEmbeddingModel)
  • Dependency update commands
  • Before/after transformation examples for tools, embeddings, step limits
  • Verification steps and common issues
  • New v6 features (tool approval, reasoning streaming, token details)
• Remove outdated TODO comment in deltas.ts (partial tool calls now handled)

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