Spawns the real command in a pseudo-terminal against a fake API server
(canned status/unified/approvals plus an SSE stream the test pushes
into), which is the only way to cover raw-mode key decoding, frames
reaching a terminal, SSE-driven refresh and the exit sequence that has to
restore the user's screen.
Two details the assertions depend on: frames are addressed absolutely
rather than newline-separated, so the parser takes the last COMPLETE
frame (the pty delivers one in several chunks, and reading a half-written
frame would be racy), and it reads the sidebar column only, or a name
echoed in the preview pane could answer for a row.
The child gets its own data dir and a tmux socket name nothing runs on,
so nothing here can see or touch the machine's real sessions.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
