Potential fix for code scanning alert no. 38: Workflow does not contain permissions

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: D-K-P

.github/workflows/typecheck.yml

@@ -3,6 +3,9 @@ name: "ʦ TypeScript"
 on:
   workflow_call:
 
+permissions:
+  contents: read
+
 jobs:
   typecheck:
     runs-on: ubuntu-latest