RokuLab 0.1.0-alpha.9

Fixes the portable shutdown JavaScript error after opening a project. Watcher cleanup now captures the webContents ID before destruction, cancels pending reload timers, and suppresses IPC after teardown. Includes graceful-close regression coverage in development and the packaged Windows app. Windows x64 portable is unsigned. SHA-256: 2C727EC6A2674008E81FCCC93F131EA1E02C40DBE52671AC4B0ECD0B263FF952