[CI] Fast-fail on lint check failure in check-stage-health (#22400)

.github/actions/check-stage-health/action.yml

@@ -1,5 +1,5 @@
 name: Check Stage Health
-description: Fail fast if any job in the current workflow run has already failed. Auto-skips for scheduled runs.
+description: Fail fast if any job in the current workflow run has already failed, or if the lint check (from lint.yml) has failed. Auto-skips for scheduled runs.
 
 inputs:
   github-token:
@@ -29,6 +29,24 @@ runs:
             return;
           }
 
+          // Check lint status from the separate Lint workflow (lint.yml).
+          // listJobsForWorkflowRun only sees jobs within the SAME run, so we use
+          // checks.listForRef which queries by commit SHA across ALL workflows.
+          const ref = context.payload.pull_request?.head?.sha || context.sha;
+          const { data } = await github.rest.checks.listForRef({
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            ref: ref,
+            check_name: 'lint',
+          });
+          const lintRun = data.check_runs.find(
+            cr => cr.app?.slug === 'github-actions'
+          );
+          if (lintRun?.status === 'completed' && lintRun?.conclusion === 'failure') {
+            core.setFailed('Fast-fail: lint check failed');
+            return;
+          }
+
           const jobs = await github.paginate(github.rest.actions.listJobsForWorkflowRun, {
             owner: context.repo.owner,
             repo: context.repo.repo,