So I believe my issue is that the HDD HAOS is installed on is 100% full and that's preventing it from starting as I'm get this string of "I/O buffer" errors before it dumps me to the emergency console. HA runs on a VE in Proxmox if that is relevant. I don't know what caused it to completely fill and I naively gave it all the space available on my Proxmox machine so there is nowhere to expand the drive to which means I need to somehow reach into the VE from Proxmox or via the emergency console and delete (hopefully) some unnecessary stuff to give it enough space to sucessfully boot but I haven't found actionable specifics on how to do that.
What can I do from the emergency console to clear out some of this space?