feat(ai-quick-ask): add cj/gptel-quick-ask one-shot command

New module `modules/ai-quick-ask.el`.  Bound to `C-; a q` via
`cj/ai-keymap` ("quick ask").

`cj/gptel-quick-ask` reads a prompt in the minibuffer, creates a
transient `*GPTel-Quick*` buffer in `cj/gptel-quick-mode` (a
special-mode derivative with `q` / `escape` / `c` bindings), inserts
"Q: <prompt>" plus a response marker, then calls `gptel-request`
with `:stream t` so the answer streams into the buffer.  Doesn't
touch `*AI-Assistant*`, doesn't autosave.

Two follow-up commands work in the buffer:

- `cj/gptel-quick-dismiss` (`q` / `escape`): delete the window and
  kill the buffer.  Idempotent when the buffer is absent.
- `cj/gptel-quick-continue` (`c`): extract the prompt + response,
  seed them into `*AI-Assistant*` under proper org headings (matching
  the `cj/gptel--fresh-org-prefix` shape), display the side window,
  then dismiss the quick buffer.

13 tests cover the pure helpers (initial-text shape, response
extraction across normal / multi-line / no-marker / empty inputs,
seed-text shape), the ask path (buffer created in right mode,
prompt recorded, gptel-request called, empty-prompt error), the
dismiss path (kills buffer / no-op when absent), and the continue
path (seeds `*AI-Assistant*`, dismisses quick buffer, errors
outside a quick buffer).  `gptel-request` is stubbed in tests so
nothing hits the network.

0 files changed, 0 insertions, 0 deletions