chore(ci): restrict GITHUB_TOKEN to contents: read (#1863)

Workflow runs checks only; no GitHub API writes. Post-CVE-2025-30066 hardening pattern.

Signed-off-by: Arpit Jain <arpitjain099@gmail.com>

Author: arpitjain099

.github/workflows/ci.yml

@@ -16,6 +16,9 @@ on:
       - .github/workflows/ci.yml
       - .github/workflows/remark-lint-problem-matcher.json
 
+permissions:
+  contents: read
+
 jobs:
   lint:
     runs-on: ubuntu-latest