Ensure Required Reference Check Emits

The main ruleset requires the typecheck + full test suite status check, but the workflow that emits that context is path-filtered. PRs that do not touch the filtered paths can become blocked because the required context never appears.

The required GitHub status context should be emitted by the job that branch protection already names: typecheck + full test suite. The workflow should not rely on GitHub path filtering for a required check because a skipped workflow is not a useful terminal result for autonomous merge.

Branch-protection-required status checks SHALL emit a terminal success or failure result for every pull request and merge-group that is eligible to merge, even when heavy validation is intentionally skipped because the changed files do not affect that check's scope.