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When the gateway subprocess raises an unhandled exception during a voice-mode turn, nothing survives: stdout is the JSON-RPC pipe, stderr flushes but the process is already exiting, and no log file catches Python's default traceback print. The user is left with an undiagnosable "gateway exited" banner. Install: - sys.excepthook → write full traceback to tui_gateway_crash.log + echo the first line to stderr (which the TUI pumps into Activity as a gateway.stderr event). Chains to the default hook so the process still terminates. - threading.excepthook → same, tagged with the thread name so it's clear when the crash came from a daemon thread (beep playback, TTS, silence callback, etc.). - Turn-dispatcher except block now also appends a traceback to the crash log before emitting the user-visible error event — str(e) alone was too terse to identify where in the voice pipeline the failure happened. Zero behavioural change on the happy path; purely forensics.