Add "stop" and "rename" to the Alt+p tool palette so a session can be
managed from inside its own harness window, mirroring the TUI's s/r keys:
- stop kills the harness window (stop_session_for_window).
- rename prompts for a nickname, pre-filled with the current one. The
name is read from /dev/tty via readline (the fzf pipe leaves our stdin
spent) and never passes through tmux's command parser, so there's
nothing to quote-escape.
Extract require_session_id_for_window as the shared resolve-or-raise
guard behind the tool/stop/rename branches, dropping the duplicated
"not an hqt session window" check.
Also removes the now-shipped feature plans and specs under docs/.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
felixm
fc95bf9830