docs: add Kernel guide + improved doc/intro content#607

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sam-notte wants to merge 3 commits intomainfrom

docs-improvements-clean

Commits on Oct 27, 2025

docs: add Kernel and Steel integration guides, improve intro content
sam-notte
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Commits on Oct 28, 2025

fix: capture session_id before context closes and grammar error
sam-notte
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Commits on Jan 29, 2026

Update steel.mdx
sam-notte
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