Show generated workflow diffs in CI

Print compiler changes when lock synchronization fails so platform-specific output can be diagnosed from the job log.

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

Author: juliamuiruri4

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

@@ -56,6 +56,7 @@ jobs:
             changes="$(git status --porcelain --untracked-files=all -- .github/workflows)"
             if [[ -n "$changes" ]]; then
               printf '%s\n' "$changes"
+              git --no-pager diff -- .github/workflows
               echo "Compile generated workflow changes. Commit every synchronized .lock.yml file."
               exit 1
             fi