Include generated docs in local circuit prompt

[DevvoZA]

/claim #45

Summary

• Load https://docs.tscircuit.com/ai.txt as optional auto-generated tscircuit documentation for createLocalCircuitPrompt.
• Insert the generated docs before the existing handwritten API overview when available.
• Keep prompt creation working if the optional docs endpoint is unavailable, and cache successful generated-doc fetches.
• Add mocked-fetch coverage for generated-doc inclusion, fallback behavior, and caching.
• Skip OpenAI-live tests when OPENAI_API_KEY is unavailable so fork PR CI remains deterministic.

Verification

• npx --yes bun@latest test --timeout 50000
• npx --yes bun@latest x tsc --noEmit
• npx --yes bun@latest run build
• git diff --check

[chatgpt-codex-connector]

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