Add initial Pico-8 cartridges for testing

- Created test_cart.p8 with basic drawing functionality and a print statement.
- Created test_unix.p8 with a simple initialization function.

scripts/types/NumberType.js

@@ -0,0 +1,17 @@
+/**
+ * @typedef {import('./TypeRegistry.js').TypeDescriptor} TypeDescriptor
+ */
+
+/** @type {TypeDescriptor} */
+export const NumberType = {
+  id: "number",
+  label: "Number",
+  color: "#3ee581",
+  isVariable: true,
+  isLocalVariable: true,
+  defaultValue: 0,
+  variablePropertyKey: "valueNumber",
+  compatibleWith: [
+    { type: "color", convert: (v) => Math.floor(Number(v)) % 16 },
+  ],
+};