fix(eat): forward word-motion arrows to the terminal in agent buffers

C-/M-left/right were in EAT's default eat-semi-char-non-bound-keys, so they fell through to Emacs and ran left-word/right-word, moving point in the EAT buffer instead of being sent to the program. The terminal's own cursor never moved, so the next keystroke snapped point back to the real cursor -- the "cursor jumps back" symptom when editing claude's input. Bind them to eat-self-input so they forward as word motion, the way ghostel did. Window arrows (S-, C-M-) still reach Emacs for windmove and buffer-move.

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