DanteTerm control via dsh

DanteTerm is Dante's fork of Wave Terminal (dandacompany/danteterm). The CLI is dsh (Wave's wsh renamed), environment variables are DANTETERM_*, and the AI sidebar has been removed, so wsh ai has no counterpart. Everything else maps one-to-one.

dsh is DanteTerm's CLI. It can create tabs, place blocks, type into other terminals, read their output, and open files or URLs in the right kind of block. That makes DanteTerm usable as a workspace an agent arranges and drives, not just a terminal.

Check these two things first

1. Running inside DanteTerm. dsh authenticates through DANTETERM_JWT, injected into shells DanteTerm starts. Outside a DanteTerm block every command fails.

[ -n "$DANTETERM_JWT" ] && echo "inside DanteTerm" || echo "not inside DanteTerm"