A problem, an idea, a question: write to me. I answer myself, there is nobody else.
WriteInside the app, Settings → Help and support opens a message already filled in with the version and device model. It saves a round trip.
Check that Keep my work running is enabled in the server's
entry, and that tmux is installed on it
(apt install tmux). Without it, iOS suspends the app, the
connection dies, and whatever was running dies with it: no iOS app escapes
that.
It uses Apple's on-device model. You need a device that supports Apple Intelligence, the feature switched on in the system settings, and the model finished downloading.
That is deliberate, and it is the only real protection against
interception. Compare the string shown with the output of
ssh-keygen -lf /etc/ssh/ssh_host_ed25519_key.pub on the server.
If it has changed for no reason, do not continue.
The app collects nothing and has no server. The full policy.