* Align workflows with Sea Haven CI/CD handbook
Bring the workflow suite in line with the handbook: bump
actions/checkout to v7 (Node 24 runtime, already standardized),
kebab-case the two snake_case workflow filenames, and add the
org-standard Labeler caller and Dependency Review gate so vulnerable
or disallowed-license deps and unlabeled PRs are caught automatically.
File renames only — job/check display names are unchanged, so the
promotion gate's REQUIRED_CHECKS and branch-protection required
checks are unaffected.
Refs: INFRA-115
* Drop Agent prefix from CI workflow + job names
The handbook names workflows for what they do (CI, Deploy, Labeler),
not the component they run, matching .github and afterhours-shift-manager.
Rename the suite to CI and its jobs to Lint / Format check / Unit tests,
and keep the promotion gate's REQUIRED_CHECKS in sync.
Refs: INFRA-115
---------
Co-authored-by: seahaven-openswe[bot] <296972425+seahaven-openswe[bot]@users.noreply.github.com>
