A desktop shell for DeepSeek Harness

Key features

• dsh moves fast and occasionally ships breaking changes, and plugins often lag behind — so a dsh update can leave the backend unable to boot, and a plugin that used to work can suddenly take the whole harness down with it.
• if the chosen source breaks, the shell falls back to the other one and tells you why
• Frameless immersive window — no native title bar
• Data (DSH_HOME)defaults to /.dsh (honors the $DSH_HOME environment variable) — profiles, sessions, storage
• Until now, all the shell told you was a dead-end "backend exited unexpectedly" dialog: no plugin name, no error detail, no way to fix anything in place.