chore: snapshot docs for v3.0.20

[aao-release-bot]

This PR creates a documentation snapshot for release v3.0.20.

Changes:

• Added dist/docs/3.0.20/ with frozen documentation
• Updated docs.json to reference the new snapshot

Auto-generated by the release-docs workflow.

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Project	Status	Preview	Updated (UTC)
adcp	🔴 Failed	–	Jul 2, 2026, 7:20 AM

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[aao-release-bot]

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[bokelley]

Approved as the immutable documentation snapshot for published v3.0.20. Merge this before #5799; #5799 must then be rebased/regenerated so docs.json retains both 3.0.20 and 3.0.21 navigation entries. The stale Mintlify preview failure is not a content finding; repository checks are otherwise green and there are no CodeQL comments or unresolved threads.