feat(labels): add manual audit/repair dispatch for managed labels

.github/workflows/workflow-sanity.yml

@@ -63,3 +63,47 @@ jobs:
 
             - name: Lint GitHub workflows
               uses: rhysd/actionlint@393031adb9afb225ee52ae2ccd7a5af5525e03e8 # v1.7.11
+
+    contributor-tier-consistency:
+        runs-on: blacksmith-2vcpu-ubuntu-2404
+        timeout-minutes: 10
+        steps:
+            - name: Checkout
+              uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+
+            - name: Verify contributor-tier parity across workflows
+              shell: bash
+              run: |
+                  set -euo pipefail
+                  python3 - <<'PY'
+                  import re
+                  from pathlib import Path
+
+                  files = [
+                    Path('.github/workflows/labeler.yml'),
+                    Path('.github/workflows/auto-response.yml'),
+                  ]
+
+                  parsed = {}
+                  for path in files:
+                    text = path.read_text(encoding='utf-8')
+                    rules = re.findall(r'\{ label: "([^"]+ contributor)", minMergedPRs: (\d+) \}', text)
+                    color_match = re.search(r'const contributorTierColor = "([0-9A-Fa-f]{6})"', text)
+                    if not color_match:
+                      raise SystemExit(f'failed to parse contributorTierColor in {path}')
+                    parsed[str(path)] = {
+                      'rules': rules,
+                      'color': color_match.group(1).upper(),
+                    }
+
+                  baseline = parsed[str(files[0])]
+                  for path in files[1:]:
+                    entry = parsed[str(path)]
+                    if entry != baseline:
+                      raise SystemExit(
+                        'contributor-tier mismatch between workflows: '
+                        f'{files[0]}={baseline} vs {path}={entry}'
+                      )
+
+                  print('contributor tier rules/color are consistent across label workflows')
+                  PY