Wave Terminal control via wsh

wsh is Wave Terminal'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 Wave usable as a workspace an agent arranges and drives, not just a terminal.

Check these two things first

1. Running inside Wave. wsh authenticates through WAVETERM_JWT, injected into shells Wave starts. Outside a Wave block every command fails.

[ -n "$WAVETERM_JWT" ] && echo "inside Wave" || echo "not inside Wave"

2. Version. Tab management, sendkeys, and block placement need v0.17.4+: