feat(js): m03 rules with fixtures and tests

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

fixtures/m03-move.json

@@ -0,0 +1,75 @@
+{
+  "function": "move",
+  "cases": [
+    {
+      "name": "move-up",
+      "args": [
+        {
+          "x": 3,
+          "y": 3
+        },
+        "Up"
+      ],
+      "expected": {
+        "x": 3,
+        "y": 2
+      }
+    },
+    {
+      "name": "move-down",
+      "args": [
+        {
+          "x": 3,
+          "y": 3
+        },
+        "Down"
+      ],
+      "expected": {
+        "x": 3,
+        "y": 4
+      }
+    },
+    {
+      "name": "move-left",
+      "args": [
+        {
+          "x": 3,
+          "y": 3
+        },
+        "Left"
+      ],
+      "expected": {
+        "x": 2,
+        "y": 3
+      }
+    },
+    {
+      "name": "move-right",
+      "args": [
+        {
+          "x": 3,
+          "y": 3
+        },
+        "Right"
+      ],
+      "expected": {
+        "x": 4,
+        "y": 3
+      }
+    },
+    {
+      "name": "move-does-not-wrap-at-the-edge",
+      "args": [
+        {
+          "x": 0,
+          "y": 0
+        },
+        "Up"
+      ],
+      "expected": {
+        "x": 0,
+        "y": -1
+      }
+    }
+  ]
+}