fix(ai): explicit end-of-session placement for new windows

tmux's default new-window placement chooses the lowest free index, which can land between existing windows when the session's window indexes have gaps. The -a flag plus the :{end} target makes it explicit: insert after the existing last window, every time.

The change only touches create_window. The two tmux new-session sites (single_mode and multi_mode first window) create fresh sessions; the first window's position is whatever base-index dictates, and there's nothing to append after.

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