T20-F2/F3/F5/F6: reset stuck executing cards, reclaim AbortControllers via removeTurn, wrap chat/doc panes, and split SSE on CRLF blank lines as well as LF.
T20-F2/F3/F5/F6: reset stuck executing cards, reclaim AbortControllers via removeTurn, wrap chat/doc panes, and split SSE on CRLF blank lines as well as LF.