Extend the existing real Electron public-tool fixture with assignment aliases for BrowserWindow, contextBridge, ipcMain, and ipcRenderer. Assert exact static recovery counts and observe the handler invocation after a real click.
Verified the public CLI/stdio MCP fixture, IPC invocation, cancellation, and owned-process cleanup against checksum-verified Electron 43.3.0 on macOS ARM64. Build and check:fast pass. The separate readiness reload/crash scenario still fails on a destroyed execution context; this commit does not claim the full verify:electron lane passes.