ci: open drift issues on job-level sensor failures

.github/workflows/drift-to-issue.yml

@@ -8,6 +8,11 @@ name: Drift to issue
 #
 # Only fires on main / scheduled runs, not on PRs (we don't want every PR
 # to open issues — the in-PR annotation from harness.yml is enough there).
+#
+# Every Harness job sets continue-on-error: true, so the Harness *run*
+# concludes `success` even when a sensor fails. Don't gate on
+# workflow_run.conclusion — the per-job conclusions from the jobs API are
+# the only place a failed sensor shows up (as `failure`).
 
 on:
   workflow_run:
@@ -21,12 +26,14 @@ permissions:
 
 jobs:
   open-or-update-issue:
+    # `branches:` above matches the Harness run's head branch, which a fork
+    # PR from `<fork>:main` also satisfies — exclude PR runs explicitly.
+    if: github.event.workflow_run.event != 'pull_request'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
 
       - name: Find failed jobs and (re)open issues
-        if: github.event.workflow_run.conclusion == 'failure'
         env:
           GH_TOKEN: ${{ github.token }}
           RUN_ID: ${{ github.event.workflow_run.id }}
@@ -79,6 +86,14 @@ jobs:
                   )
                   print(f"updated #{num}: {title}")
               else:
+                  # `gh issue create --label` fails if the label doesn't exist
+                  # yet; --force makes this an idempotent create-or-update.
+                  subprocess.run(
+                      ["gh", "label", "create", "harness-drift", "--force",
+                       "--color", "d93f0b",
+                       "--description", "Tracking issue opened by drift-to-issue.yml"],
+                      check=True,
+                  )
                   subprocess.run(
                       ["gh", "issue", "create", "--title", title, "--body", body,
                        "--label", "harness-drift"],