Add write permission for issues

Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>
Signed-off-by: Philipp Burckhardt <pburckhardt@outlook.com>

Author: Planeshifter

.github/workflows/claude.yml

@@ -20,8 +20,8 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: read
-      pull-requests: read
-      issues: read
+      pull-requests: write
+      issues: write
       id-token: write
     steps:
       - name: Checkout repository