Quickstart notebook: guard install cell with importlib.util.find_spec (v1.0.6 postmortem)

examples/quickstart.ipynb

@@ -9,7 +9,7 @@
   {
    "cell_type": "code",
    "id": "2d22fcd3",
-   "source": "# Colab / fresh-kernel install. Local users with `uv add` already done can skip this cell.\n%pip install -q \"counterstrike1k @ git+https://github.com/AnirudhhRamesh/counterstrike1k\" datasets pandas matplotlib pillow av",
+   "source": "# Colab / fresh-kernel install. Skipped automatically if counterstrike1k is\n# already importable (e.g. local `uv add` users) so the cell is silent.\nimport importlib.util\nif importlib.util.find_spec(\"counterstrike1k\") is None:\n    %pip install -q \"counterstrike1k @ git+https://github.com/AnirudhhRamesh/counterstrike1k\" datasets pandas matplotlib pillow av",
    "metadata": {},
    "execution_count": null,
    "outputs": []