fix(ai-vterm): make F9 toggle the agent from inside an agent buffer

vterm binds `<f1>`..`<f12>` to `vterm--self-insert`, so a plain `<f9>` typed while point is in an agent buffer goes to the terminal program instead of the global toggle. That's invisible most of the time — you press F9 from another window — but it bites when the agent buffer is the only window in the frame, because there's nowhere else to press it from.

I re-bound the F9 family in `vterm-mode-map` (via `with-eval-after-load 'vterm`) so that `<f9>`, `C-<f9>`, and `M-<f9>` reach `cj/ai-vterm`, `cj/ai-vterm-pick-project`, and `cj/ai-vterm-pick-buffer` from there too. The C-/M- variants aren't actually in vterm's intercept set, but binding them keeps things uniform. New `tests/test-ai-vterm--f9-in-vterm.el`: 4 ERT tests over the `vterm-mode-map` and global bindings. F12's `cj/vterm-toggle` has the same shape of bug and isn't touched here.

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