Notebook: hard-code REPO_URL to Inject-Arena GitHub

Replaces the <USERNAME> placeholder so Cell 1 (Setup) clones the right
repo on first Colab run.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

notebooks/colab_runner.ipynb

@@ -36,7 +36,7 @@
     "except Exception:\n",
     "    pass\n",
     "\n",
-    "REPO_URL = 'https://github.com/<USERNAME>/injectarena.git'  # TODO(jaswanth): fill in\n",
+    "REPO_URL = 'https://github.com/Jaswanth-K1210/Inject-Arena.git'\n",
     "if not os.path.exists('/content/injectarena'):\n",
     "    url = REPO_URL.replace('https://', f'https://{os.environ[\"GH_TOKEN\"]}@') if os.environ.get('GH_TOKEN') else REPO_URL\n",
     "    subprocess.run(['git', 'clone', url, '/content/injectarena'], check=True)\n",
@@ -184,4 +184,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 5
-}
+}