ci: implement codebase-aware effort level triage (#26666)

.github/scripts/cleanup-triage-labels.cjs

@@ -0,0 +1,50 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+const fs = require('node:fs');
+
+module.exports = async ({ github, context, core }) => {
+  let issuesToCleanup = [];
+  try {
+    const fileContent = fs.readFileSync('issues_to_cleanup.json', 'utf8');
+    issuesToCleanup = JSON.parse(fileContent);
+  } catch (error) {
+    if (error.code === 'ENOENT') {
+      core.info('No issues found to clean up.');
+      return;
+    }
+    core.setFailed(`Failed to read issues_to_cleanup.json: ${error.message}`);
+    return;
+  }
+
+  for (const issue of issuesToCleanup) {
+    try {
+      await github.rest.issues.removeLabel({
+        owner: context.repo.owner,
+        repo: context.repo.repo,
+        issue_number: issue.number,
+        name: 'status/need-triage',
+      });
+      core.info(
+        `Successfully removed status/need-triage from #${issue.number}`,
+      );
+    } catch (error) {
+      if (error.status === 404) {
+        core.info(
+          `Label status/need-triage not found on #${issue.number}, skipping.`,
+        );
+      } else {
+        core.warning(
+          `Failed to remove label from #${issue.number}: ${error.message}`,
+        );
+      }
+    }
+  }
+
+  core.info(
+    `Cleaned up status/need-triage from ${issuesToCleanup.length} issues.`,
+  );
+};