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/core/lua/LuaLiteralString.js

@@ -0,0 +1,38 @@
+/**
+ * @typedef {import('./LuaLiteralTypes.js').LuaLiteralHandler} LuaLiteralHandler
+ */
+
+/** @type {LuaLiteralHandler} */
+export const LuaLiteralString = {
+  /**
+   * @param {unknown} value
+   * @returns {string}
+   */
+  format(value) {
+    return JSON.stringify(String(value ?? ""));
+  },
+
+  /** @returns {string} */
+  defaultLiteral() {
+    return '""';
+  },
+
+  spawnableByDefault: true,
+
+  nodeModule: {
+    definition: {
+      id: "string_literal",
+      title: "String",
+      category: "Values",
+      description: "Constant string literal.",
+      searchTags: ["string", "literal", "text", "value"],
+      inputs: [],
+      outputs: [{ id: "value", name: "Value", direction: "output", kind: "string" }],
+      properties: [{ key: "value", label: "Text", type: "string", defaultValue: "hello" }],
+    },
+    behavior: {
+      evaluateValue: ({ node, formatLiteral }) =>
+        formatLiteral("string", node.properties.value ?? ""),
+    },
+  },
+};