docs(test): add equation numbering notebook smoke test

equation-numbering.ipynb

@@ -0,0 +1,38 @@
+{
+  "cells": [
+    {
+      "cell_type": "markdown",
+      "metadata": {},
+      "source": [
+        "# Equation Numbering Test\n",
+        "\n",
+        "Inline math: $a^2 + b^2 = c^2$.\n",
+        "\n",
+        "Manual equation tag:\n",
+        "\n",
+        "$$\n",
+        "\\\\int_0^1 x^2 \\\\, dx = \\\\frac{1}{3} \\\\tag{1}\n",
+        "$$\n",
+        "\n",
+        "Second equation:\n",
+        "\n",
+        "$$\n",
+        "f(x) = x^2 + 1 \\\\tag{2}\n",
+        "$$\n"
+      ]
+    }
+  ],
+  "metadata": {
+    "kernelspec": {
+      "display_name": "Python 3",
+      "language": "python",
+      "name": "python3"
+    },
+    "language_info": {
+      "name": "python",
+      "version": "3.12.0"
+    }
+  },
+  "nbformat": 4,
+  "nbformat_minor": 5
+}