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/unit/tw_performance_measure_error.js

@@ -0,0 +1,19 @@
+const test = require('tap').test;
+const fs = require('fs');
+const path = require('path');
+const VirtualMachine = require('../../src/virtual-machine');
+
+global.performance = {
+    mark () {
+        // No-op
+    },
+    measure () {
+        throw new Error('Mock error to simulate browser garbage collecting one of the marks before this code runs');
+    }
+};
+
+test('performance.measure() error in loadProject is ignored', async t => {
+    const vm = new VirtualMachine();
+    await vm.loadProject(fs.readFileSync(path.join(__dirname, '..', 'fixtures', 'tw-empty-project.sb3')));
+    t.end();
+});