Print 'v1 results:' header before score loop

VS Code's notebook output renderer strips leading whitespace from the
first line of stdout, so the api-platform row rendered two columns left
of the others. A header line at position 0 absorbs the strip and the
data rows stay aligned.

Author: markn-ant

managed_agents/CMA_prompt_versioning_and_rollback.ipynb

@@ -170,6 +170,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
+      "v1 results:\n",
       "  api-platform   5/5\n",
       "  auth           5/5\n",
       "  billing        4/5\n",
@@ -220,6 +221,7 @@
     "\n",
     "\n",
     "v1_scores = score(version=1)\n",
+    "print(\"v1 results:\")\n",
     "for team, (correct, total) in sorted(v1_scores.items()):\n",
     "    print(f\"  {team:14s} {correct}/{total}\")"
    ]