Per the updated handbook convention (engineering-handbook PR #18),
reusable-workflow references use full commit SHA pins with a '# main'
comment instead of the mutable @main branch ref. Templates now ship
pinned so new repos start convention-compliant; Dependabot advances
the pin after instantiation. Commented usage examples in ci-static and
ci-typescript-frontend use the <full-commit-sha> placeholder form.
Add callable-labeler.yaml, a reusable workflow that carries the label
rules inline as the single source of truth and writes them to the runner
at execution time, so caller repos need only a short caller workflow and
no per-repo labeler.yml. Triggered by callers on pull_request (private org
takes no fork PRs); requires contents:read + pull-requests:write +
issues:write on every caller so labeler@v5 can create missing labels.
Remove the workflow-templates/labeler.yml starter it supersedes (no
ruleset workflows-rule or compliance-audit reference depends on it).
Add the repo's own dependabot.yml (github-actions, weekly, grouped
minor+patch) to keep the action pins current per the Pinning Principle.
