* ci(pr-checks): add Conventional Commits PR-title check, pin actions by SHA
Add a check-title job that fails the PR when the title is not Conventional
Commits format (type(scope): summary), via an inline github-script regex.
Pin the workflow's actions to their latest release commit SHAs:
actions/checkout v6.0.3 and actions/github-script v9.0.0.
* ci(pr-checks): flag unmergeable PRs in the PR-checks workflow
Add a check-mergeable job to the (renamed) PR checks workflow: on PR events,
poll the PR's mergeable state and, when it conflicts with the base, remove
'ready for review', add a red 'merge conflict' label (auto-created), and
comment; clear the label once mergeable again. Single-PR, no push trigger.
Add ready_for_review to the trigger types.
* ci(pr-checks): drop the comment from check-mergeable, label swap only
* ci(pr-checks): least-privilege workflow permissions
contents:read for base-ref checkout, pull-requests:read for pulls.get
mergeability, issues:write for label + comment management. Drops the
unused pull-requests:write (labels and PR comments go through the issues
API).
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