feat(ai-term): run agents through EAT instead of ghostel

Port ai-term from ghostel to EAT. Agents spawn in an EAT terminal running the same tmux session (tmux new-session -A -s aiv-<project>), so the persistence and detach/reattach model is unchanged. A spike confirmed EAT + tmux detach and reattach exactly like ghostel + tmux. The swaps: (ghostel) becomes (eat) with eat-buffer-name carrying the agent name, ghostel-send-string becomes a process-send-string helper, and the M-SPC swap chord is bound directly in eat-semi-char-mode-map (no exception-list plus rebuild dance). Buffer detection was already name-based, so the dispatch, next, and cycle logic is unchanged. Dropped the now-unused suppress-tmux variable. Tests updated to mock eat.

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