Curiously, there is ‘no-catch’ in the CAR of ‘var’ contents, but
i was not able to find any mention of it in the Elisp reference
manual.

   > (d) Is there a more idiomatic way to work w/ threads and
   >     ‘url-http’ (or async network connections, in general)?

   [url-*.el overview, plus emacs-aio]

I hope to be able to study these Someday.

   > Thank-you for any insight into this corner of Emacs Lisp!

   [‘read-string’ in batch mode]

Thanks for the tip.  It's good to see Emacs can be useful in
many different contexts.

-- 
Thien-Thi Nguyen -----------------------------------------------
 (defun responsep (query)               ; (2022) Software Libero
   (pcase (context query)               ;       = Dissenso Etico
     (`(technical ,ml) (correctp ml))
     ...))                              748E A0E8 1CB8 A748 9BFA
--------------------------------------- 6CE4 6703 2224 4C80 7502