Add v2 to v3 migration guide#1843

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nginx-seanmoloney wants to merge 17 commits intomainfrom

agent/upgrade-v2-v3-doc

Commits on Apr 9, 2026

Add v2 to v3 migration guide
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Commits on Apr 13, 2026

Improve instructions when running with a mounted file
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Commits on Apr 16, 2026

Refactor the update page
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docs(agent): migrate v2→v3 upgrade guide; update installation docs; add migration/; remove deprecated upgrade-v2-v3.md
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Commits on Apr 20, 2026