docs(spec): correct the Emacs launch surface to ghostel + ai-term.el

The first draft of the Emacs open issue assumed eat/vterm and invented an ai --no-tmux mode for a tmux-less path that doesn't exist. Verified against the actual config: the terminal is ghostel (native emulator over libghostty-vt), and ai-term.el is already the Emacs AI launch surface, creating project-named aiv- tmux sessions with liveness badges and crash recovery.

Emacs-born agents are therefore tmux-parented like shell launches, so detection is uniform across surfaces. The remaining design is integration, not a new surface: ai-term.el's session-create learns the roster, export, and opener steps, the picker gains a [helper] badge, and the launchers share only the agent-roster script since ai-term owns its own session naming and window placement.

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