Make the verdict backstop actually run

The matrix-result gate was written without always(), so a failing Summarize step
skipped it - meaning the backstop only ever ran when it was not needed. It now
runs regardless, which is the only way it can serve its purpose of catching a
failed matrix that the API-driven summary somehow missed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QnudSHxoU7c8HcBkNk4Yvk

Author: claude

.github/workflows/test-gauntlet.yml

@@ -653,7 +653,9 @@ jobs:
       # Belt and braces: if the API listing above ever came back empty, the
       # matrix results themselves still gate the run.
       - name: Gate on the matrix results
-        if: needs.gauntlet.result != 'success' || needs.arch.result != 'success'
+        # always(), or a failing Summarize skips this and the backstop never
+        # runs - which defeats the point of having one.
+        if: always() && (needs.gauntlet.result != 'success' || needs.arch.result != 'success')
         run: |
           echo "gauntlet matrix: ${{ needs.gauntlet.result }}"
           echo "arch matrix    : ${{ needs.arch.result }}"