There are no Z-Wave related errors there, only some entries about Home Assistant starting and restarting, and the occasional Sonos play/pause logs from my speakers (which it seems to have detected automatically).
Is /dev/ttyACM0 the right usb controller path for your install? In the Z-wave docs there is a section about finding the correct usb path. Perhaps that is of help to you?
Yup, I’ve checked that the path is correct, using ls /dev/tty* in SSH.
I’m gonna reset my entire Synology and give the entire setup a try again. Maybe it’ll work this time… I’m not hopeful, but I haven’t got much to lose since it was a new setup to begin with.