fix(release): publish with ignored-only changesets

[dancormier]

Summary

• temporarily exclude ignored-only changesets in the release runner
• preserve tracked ignored changesets for later package readiness
• retain normal release-PR behavior when actionable changesets exist
• add stable and prerelease coverage for release-state handling
• document the release behavior in the README and release ADR

Context

After #2367 merged, main CI passed but changesets/action@v1 failed before publication. The ignored Email changeset caused the action to attempt an empty release PR instead of publishing the prepared stable package versions.

No packages were published.

Verification

• npm ci
• npm run test:release — 5 passed
• npm run build
• npm run lint
• focused ESLint and Prettier checks
• workflow YAML parsing
• independent review with no remaining findings

Jira

STACKS-846

[netlify]

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[netlify]

✅ Deploy Preview for stackoverflow-email ready!

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[changeset-bot]

⚠️ No Changeset found

Latest commit: a0b06d7

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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