When a project_file command was unacknowledged for 15s, Bambuddy
previously logged "printer may need restart" and left the broken MQTT
session in place — requiring the user to power-cycle the printer. The
existing half-broken-session recovery only ran via the developer-mode
probe path, which skips printers with a known developer_mode value.
Extract the existing force-reconnect logic into a reusable helper and
call it from _verify_print_response on dispatch timeout. The next
dispatch attempt then lands on a fresh MQTT session without a reboot.