Simplify notebook setup

docs/examples/simple/train.ipynb

@@ -26,56 +26,18 @@
     "\n",
     "Use Python 3.12 or 3.13 and install this checkout with `uv pip install --editable '.[notebooks]'`.\n",
     "See **Run notebooks locally** in the repository README for the kernel, execution order,\n",
-    "and full-data options. Generated artifacts stay under `.cache/notebooks/`.\n"
+    "and full-data options. Run related notebooks from the same working directory\n",
+    "to share the default `.cache/` model store and `tracing_database.json` database.\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": null,
    "id": "d8ae0655",
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "\u001b[38;5;226mEnvironment variable ENVIRONMENT is not set, defaulting to development mode ‼️\u001b[0m\n",
-      "\u001b[38;5;226mThe selected tracing database (ParallelTinyDbDriver) is not recommended for production\u001b[0m\n",
-      "\u001b[38;5;39mGreatAI (v0.1.11): configured ✅\u001b[0m\n",
-      "\u001b[38;5;39m  🔩 tracing_database: ParallelTinyDbDriver\u001b[0m\n",
-      "\u001b[38;5;39m  🔩 large_file_implementation: LargeFileLocal\u001b[0m\n",
-      "\u001b[38;5;39m  🔩 is_production: False\u001b[0m\n",
-      "\u001b[38;5;39m  🔩 should_log_exception_stack: True\u001b[0m\n",
-      "\u001b[38;5;39m  🔩 prediction_cache_size: 512\u001b[0m\n",
-      "\u001b[38;5;39m  🔩 dashboard_table_size: 50\u001b[0m\n"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Notebook artifacts: /Users/schmelczer/Projects/great-ai/.cache/notebooks/simple\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
-    "import os\n",
-    "import sys\n",
-    "from pathlib import Path\n",
-    "\n",
-    "# Works when opened from the repository root or any notebook directory.\n",
-    "_start = Path(globals().get(\"__file__\", Path.cwd())).resolve()\n",
-    "ROOT = next(\n",
-    "    p\n",
-    "    for p in [_start, *_start.parents]\n",
-    "    if (p / \"pyproject.toml\").is_file() and (p / \"great_ai\").is_dir()\n",
-    ")\n",
-    "sys.path.insert(0, str(ROOT / \"docs\"))\n",
-    "from notebook_support import setup_notebook, mag_lines\n",
-    "\n",
-    "FULL_RUN = os.environ.get(\"GREAT_AI_NOTEBOOK_FULL\") == \"1\"\n",
-    "WORK_DIR = setup_notebook(ROOT, \"simple\")\n",
-    "DATA_DIR = ROOT / \"docs/tutorial/data\""
+    "from docs.notebook_support import FULL_RUN"
    ]
   },
   {