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.
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