A no-op implementation of the Ikenga Engine contract. It accepts sessions and
streams a single canned message_delta echoing the input, followed by a done
event.
- Test fixture — proves the engine kernel's pluggability pattern and event flow without spawning a real model process.
- Shell-without-AI mode — lets the shell run end-to-end in environments where no AI engine is installed or desired.
The pkg ships preinstalled as a builtin under
shell/src-tauri/resources/builtin-pkgs/com.ikenga.engine-noop/. Select it as
the active engine via the shell's pkg manager UI or the engine setting.