chore(tmux): double scrollback to 100000 lines

Long-running tmux+vterm sessions (Claude Code's TUI in particular) run past 50k lines often enough that the C-; x C tmux-history-copy command in Emacs can't reach the start. Bump history-limit so `tmux capture-pane' has more room; the cost is roughly 7.5 MB per pane, so a six-pane session adds well under 100 MB total.

Existing panes keep their current buffer; the new limit applies only to panes created after the reload.

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