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Launching from Finder or the Dock leaves the main process with stdio that has no reader. Writing there fails asynchronously with EPIPE from inside the stream machinery, and with no `error` listener Node escalates it to an uncaught exception — which Electron shows as "A JavaScript error occurred in the main process". This is reachable in ordinary use: the sidecar exit handler logs a line every time a sidecar dies, so any crashed or killed sidecar could raise that dialog. Guarding that one call site would not help, since the main process has ~25 console call sites and all of them write to the same two streams. A try/catch at the call site cannot help either, because the throw happens off-stack. Install the guard on stdout/stderr before anything logs. Losing a diagnostic line is acceptable; killing the user's session over one is not — real diagnostics already persist to a file through appendHostDiagnostic.