ci: declare minimum permissions on workflow files

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: nicklasl

.github/workflows/lint-pr-name.yaml

@@ -7,6 +7,10 @@ on:
       - edited
       - synchronize
 
+permissions:
+  contents: read
+  pull-requests: write
+
 jobs:
   main:
     name: Validate PR title