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_compat_block_utility_stackframe_exposed.js

@@ -0,0 +1,15 @@
+const {test} = require('tap');
+const fs = require('fs');
+const path = require('path');
+const VM = require('../../src/virtual-machine');
+const Timer = require('../../src/util/timer');
+
+test('compatibility stack frame is exposed on thread', t => {
+    const vm = new VM();
+    vm.loadProject(fs.readFileSync(path.join(__dirname, '../fixtures/tw-glide.sb3'))).then(() => {
+        vm.greenFlag();
+        vm.runtime._step();
+        t.ok(vm.runtime.threads[0].compatibilityStackFrame.timer instanceof Timer);
+        t.end();
+    });
+});