Authenticate workflow compilation in CI

Expose the read-only job token to gh-aw so generated action references resolve consistently with committed lock files.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: juliamuiruri4

.github/workflows/validate-agentic-workflows.yml

@@ -38,6 +38,8 @@ jobs:
 
       - name: Validate compiled workflows
         shell: bash
+        env:
+          GH_TOKEN: ${{ github.token }}
         run: |
           orphaned=0
           while IFS= read -r lock_file; do