Initial commit of 001code-html Scratch frontend project.

Includes scratch-gui, scratch-vm, scratch-blocks, scratch-render, scratch-l10n, and deployment config.

Co-authored-by: Cursor <cursoragent@cursor.com>

scratch-vm/test/integration/tw_stackframe_op.js

@@ -0,0 +1,29 @@
+const fs = require('fs');
+const path = require('path');
+const {test} = require('tap');
+const VirtualMachine = require('../../src/virtual-machine');
+
+const projectPath = path.join(__dirname, '..', 'fixtures', 'tw-stackframe-op.sb3');
+
+test('util.thread.peekStackFrame().op', t => {
+    const vm = new VirtualMachine();
+
+    vm.runtime.setCompilerOptions({
+        enabled: false
+    });
+
+    // Easiest way to test this is to overwrite an existing block
+    vm.runtime._primitives.operator_add = function (args, util) {
+        const op = util.thread.peekStackFrame().op;
+        t.equal(op.id, 'c');
+        t.end();
+
+        // return value not used
+        return 4;
+    };
+
+    vm.loadProject(fs.readFileSync(projectPath)).then(() => {
+        vm.greenFlag();
+        vm.runtime._step();
+    });
+});