Panics and the signals that end the process (SIGSEGV, SIGBUS, SIGILL,
SIGFPE, SIGABRT) now write a backtrace, with each frame's module and
offset, to $XDG_STATE_HOME/snowbound/snowbound.log (the last run's kept
as snowbound.old.log) and say where the log is. Where stderr reaches no
one, as when the desktop starts the app, stderr goes to the log as well,
as it does on Windows. The signal then ends the process as before, so
systemd-coredump still records it.

Assisted-by: claude-opus-5.5