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ai-term.el had grown to ~1,215 lines mixing project/tmux session discovery, window display policy, the EAT terminal backend, and the public commands, so a change to any one risked coupling to the others.
I extracted three layers, following the calendar-sync split shape: ai-term-sessions.el (discovery, tmux naming and parsing, launch command, picker ordering), ai-term-display.el (display-buffer actions and rule, toggle state, server-window routing), and ai-term-backend-eat.el (terminal create/reattach, pty send, EAT keymap). The backend file is named for its backend so a future one lands as a sibling. ai-term.el stays the public face (options, commands, keymap, shutdown), every name unchanged, so existing (require 'ai-term) callers and all 30 test files work as before.
The extracted layers forward-declare the face's defcustoms rather than requiring it, keeping the graph acyclic. I dropped the unused cl-lib and host-environment requires and added the three modules to the header-contract list.
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