Demonstrated on CLI 2.1.173: resuming a live session interleaves both
TUIs into one transcript (no lock, no warning) — liveness detection via
registry pid+procStart is mandatory; --fork-session is safe on live
sessions; --resume must run in the session's original cwd ("No
conversation found" otherwise); registry files are cleaned on graceful
exit AND SIGTERM, may be GC'd later after SIGKILL — never reason on
file presence. ANSI-stripped TUI text loses spaces (cursor-positioned
painting) — confirms @xterm/headless for screen parsing.
Flood: 21 MB through node-pty with 10s pause => 0 bytes leaked, no
loss, 4.7 ms echo after flood.
