Scope lint workflow token permissions

Author: Copilot

.github/workflows/lint.yaml

@@ -4,6 +4,8 @@ on: [ push, pull_request ]
 jobs:
   lint:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5