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## What changed - Replace the bundled GPT-5.6 Sol migration guide with GPT-6 Astra guidance and update model metadata, migration routes, and official documentation links. - Document GPT-6 migration compatibility checks for reasoning effort, tool calling, unsupported parameters, fast mode, and prompt caching while preserving model roles for Terra and Luna. - Refresh the prompting fallback with guidance on autonomy, instruction following, writing style, subagent delegation, and testing. Prefer live official guidance and use the bundled prompting copy only when it is unavailable. GitOrigin-RevId: d1f298b8e7517687acbf4de5cfb0cd914d3861f5