C1: The watchdog's os._exit(1) bypassed drain_log_queue() and
remove_pid_file()/release_gateway_runtime_lock() — the three things
_exit_after_graceful_shutdown does before exiting. The watchdog's own
logger.critical('shutdown watchdog fired') was silently dropped because
it was still in the async QueueListener queue when os._exit ran. PID
file and runtime lock were stranded on next boot.
W1: Dropped 2MB infographic PNG — dead asset with zero references in
the repo. Binary blobs in git history are permanent; every clone pays
the cost forever.
Authorship: @HexLab98's commits preserved via rebase-merge.
3ec4c9ce4d