fix: filter epic sync issues by label (#3089)

github-coordination sync listed every repo issue and pushed the epic label onto all of them (#3084). Scope the listing to issues carrying the policy's epic label plus issues whose body still holds the coordination marker (label-drift recovery), deduped by number, and reject an empty labels.epic in loadPolicy. Tests cover the filtered path and the recovery path with exact gh argv. Independent exact-head review passed with no P0/P1; CI 44/44 at the head.

scripts/lib/github-coordination/gh-api.js

@@ -102,7 +102,7 @@ function listIssues(repo, options = {}) {
   const { owner, name } = normalizeRepo(repo);
   const limit = Number.isFinite(options.limit) ? options.limit : 100;
   const state = options.state || 'all';
-  return runGhJson([
+  const args = [
     'issue',
     'list',
     '--repo',
@@ -111,9 +111,12 @@ function listIssues(repo, options = {}) {
     state,
     '--limit',
     String(limit),
+    ...(options.label ? ['--label', options.label] : []),
+    ...(options.search ? ['--search', options.search] : []),
     '--json',
     'number,title,body,url,state,labels,author,updatedAt,assignees',
-  ], options) || [];
+  ];
+  return runGhJson(args, options) || [];
 }
 
 function editIssue(repo, issueNumber, options = {}) {