chore(ci): fail PR CI on breaking-change commit markers

[Copilot]

This PR adds an explicit PR-time guard against unintended major semantic-release bumps. It detects breaking-change commit markers on incoming PR branches so maintainers can rewrite commit history before merging to main.

• What changed

  • Added a new PR-only job in .github/workflows/test.yml: breaking-change-commit-check.
  • The job scans commits in ${base}..${head} and fails when it finds:
    • Conventional Commit bang syntax in subject (type!: / type(scope)!:)
    • BREAKING CHANGE: / BREAKING CHANGES: footer markers in commit body
  • On failure, it prints offending commit SHAs/subjects and a clear remediation message (rewrite PR history).

• Docs update

  • Updated RELEASE.md to document that PR CI now blocks breaking-change markers to prevent accidental major bumps from feature-branch-only commits.

• Workflow snippet

  - name: Detect breaking-change commit markers
    run: |
      commits="$(git rev-list --reverse "${BASE_SHA}..${HEAD_SHA}")"
      # fail if subject matches type!:/type(scope)!:
      # or body contains BREAKING CHANGE(S):

[Copilot]

Pull request overview

Adds a PR-only CI guard that fails when any PR commit carries Conventional Commit breaking-change markers (type!: / type(scope)!: subjects or BREAKING CHANGE(S): footers), preventing accidental major semantic-release bumps. Also documents this guard in RELEASE.md.

Changes:

• New breaking-change-commit-check job in .github/workflows/test.yml that walks ${BASE_SHA}..${HEAD_SHA} and reports offending commits with a remediation message.
• RELEASE.md note explaining that PR CI now blocks breaking-change markers so authors can rewrite history before merging.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/test.yml	Adds the PR-only breaking-change commit scan job (uses actions/checkout@v6 with full history, bash regex over each commit's subject/body, fails with offending SHAs).
RELEASE.md	Adds one-line documentation of the new PR CI breaking-change marker check.

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