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_extension_music.js

@@ -0,0 +1,27 @@
+const test = require('tap').test;
+const Music = require('../../src/extensions/scratch3_music/index.js');
+const Runtime = require('../../src/engine/runtime.js');
+
+test('_isConcurrencyLimited', t => {
+    const rt = new Runtime();
+
+    // sanity check so that the setRuntimeOptions() call below actually does something
+    t.equal(rt.runtimeOptions.miscLimits, true, 'misc limits enabled by default');
+
+    const blocks = new Music(rt);
+    t.equal(blocks._isConcurrencyLimited(), false, 'not limited initially');
+
+    // logic here is slightly weird but this matches Scratch
+    blocks._concurrencyCounter = Music.CONCURRENCY_LIMIT;
+    t.equal(blocks._isConcurrencyLimited(), false, 'not limited at limit');
+
+    blocks._concurrencyCounter = Music.CONCURRENCY_LIMIT + 1;
+    t.equal(blocks._isConcurrencyLimited(), true, 'limited above limit');
+
+    rt.setRuntimeOptions({
+        miscLimits: false
+    });
+    t.equal(blocks._isConcurrencyLimited(), false, 'not limited when miscLimits: false');
+
+    t.end();
+});