chore(main): release 4.0.0

[release-please[bot]]

:robot: I have created a release beep boop

4.0.0 (2025-11-25)

⚠ BREAKING CHANGES

• support node 18 (#776)
• upgrade to Node 14 (#715)

Miscellaneous Chores

• Support node 18 (#776) (f5e356a)
• Upgrade to Node 14 (#715) (3b76387)

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[meredithslota]

There's a recurrent flaky test that is somewhat concerning — see #717 for context. It's possible that we should fix that first before releasing a new major just to be sure.