Add lazy piano transcription and optional leased server worker

playwright.piano.config.js

@@ -0,0 +1,6 @@
+const { defineConfig } = require('@playwright/test');
+module.exports = defineConfig({
+  ...require('./playwright.classic.config'),
+  use: { ...require('./playwright.classic.config').use, ignoreHTTPSErrors: true },
+  testMatch: /piano-engine\.spec\.js/,
+});