ci: run Package CI, Changeset, and Release on ubuntu-latest

[ScriptedAlchemy]

Summary

After #81, #75, and #80 landed on main, Package CI, Changeset, and Release sat queued on windows-latest for 30–40+ minutes with zero runners. Publish is blocked until those jobs get a runner.

This flips only runs-on from windows-latest to ubuntu-latest in:

• .github/workflows/ci.yml
• .github/workflows/changeset.yml
• .github/workflows/release.yml

This is the opposite of the earlier queue-escape (#74 macos, #76 windows Release, #77 windows Package CI + Changeset). Those rotated off starved ubuntu-* / macos-latest. Windows is the starved pool now, so the same three jobs go back to ubuntu-latest. No other workflow or product changes.

Test plan

• Package CI, Changeset, and Release checks on this PR are scheduled on ubuntu-latest (not queued indefinitely on windows-latest)
• Leave merge to the delivery whip unless checks are green and merge needs no extra approval

  

[changeset-bot]

⚠️ No Changeset found

Latest commit: dc72c7c

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-17T00:11:50.103663Z	dc72c7c	PR opened

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