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ec5094fb57
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.