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.

1 files changed, 3 insertions, 0 deletions

diff --git a/modules/ai-config.el b/modules/ai-config.el
index e7907e36..6eff1ba6 100644
--- a/modules/ai-config.el
+++ b/modules/ai-config.el
@@ -34,6 +34,7 @@
 (autoload 'cj/gptel-load-conversation "ai-conversations" "Load a saved AI conversation." t)
 (autoload 'cj/gptel-delete-conversation "ai-conversations" "Delete a saved AI conversation." t)
 (autoload 'cj/gptel-autosave-toggle "ai-conversations" "Toggle autosave in the current GPTel buffer." t)
+(autoload 'cj/gptel-quick-ask "ai-quick-ask" "One-shot quick-ask in a transient buffer." t)
 
 ;;; ------------------------- AI Config Helper Functions ------------------------
 
@@ -508,6 +509,7 @@ Works for any buffer, whether it's visiting a file or not."
   "l" #'cj/gptel-load-conversation   ;; load and continue conversation
   "m" #'cj/gptel-change-model        ;; change the LLM model
   "p" #'gptel-system-prompt          ;; change prompt
+  "q" #'cj/gptel-quick-ask           ;; one-shot quick ask
   "r" #'gptel-rewrite                ;; rewrite a region of code/text
   "c" #'cj/gptel-context-clear       ;; clear all context
   "s" #'cj/gptel-save-conversation   ;; save conversation
@@ -527,6 +529,7 @@ Works for any buffer, whether it's visiting a file or not."
     "C-; a l" "load conversation"
     "C-; a m" "change model"
     "C-; a p" "change prompt"
+    "C-; a q" "quick ask"
     "C-; a r" "rewrite region"
     "C-; a c" "clear context"
     "C-; a s" "save conversation"