feat(examples): close stale and inactive issues as 'not planned'

Author: cocosheng-g

examples/workflows/issue-cleanup/gemini-issue-cleanup.yml

@@ -120,7 +120,8 @@ jobs:
                     owner: context.repo.owner,
                     repo: context.repo.repo,
                     issue_number: issueNumber,
-                    state: 'closed'
+                    state: 'closed',
+                    state_reason: 'not_planned'
                   });
                   core.setOutput('is_stale', 'true');
                   return;
@@ -167,7 +168,8 @@ jobs:
                 owner: context.repo.owner,
                 repo: context.repo.repo,
                 issue_number: issueNumber,
-                state: 'closed'
+                state: 'closed',
+                state_reason: 'not_planned'
               });
               core.setOutput('is_stale', 'true');
               return;