on ESHELL, utf-8 and fossil command-line commit message

[Wayne Harris]

As far as I can tell in my GNU EMACS, all by buffers relevant to context
here are set to UTF-8.  I see the letter U in the first letter of the
modeline --- the GNU EMACS status bar.  (I'm on Windows, by the way.)

When I add an UTF-8 message through the command line in ESHELL, it
doesn't display properly when I say ``fossil timeline''.  Check it:

--8<---------------cut here---------------start------------->8---
%fs add encoding.txt 
ADDED  encoding.txt

%fs commit -m 'Naïve commit.'
Pull from https://mer@somewhere.edu/test
Round-trips: 1   Artifacts sent: 0  received: 0
Pull done, wire bytes sent: 442  received: 1959  ip: 5.161.138.46
New_Version: f4c20ecefc9d04d5fd2548eb4d3008d9ffb759a4deebedd595b222f81eef6b1f
Sync with https://mer@somewhere.edu/test
Round-trips: 1   Artifacts sent: 2  received: 0
Sync done, wire bytes sent: 2342  received: 309  ip: 5.161.138.46

%fs timeline
=== 2022-10-01 ===
14:03:28 [f4c20ecefc] *CURRENT* Naïve commit. (user: mer tags: trunk)
[...]
--8<---------------cut here---------------end--------------->8---

However, if instead of the command-line, I use a regular GNU EMACS
buffer, it works just fine.

--8<---------------cut here---------------start------------->8---
%echo kkk >> encoding.txt 

%fs commit
Pull from https://mer@somewhere.edu/test
Round-trips: 1   Artifacts sent: 0  received: 0
Pull done, wire bytes sent: 437  received: 2118  ip: 5.161.138.46
emacsclientw ./ci-comment-A2803F45F10B.txt
Waiting for Emacs...
Pull from https://mer@somewhere.edu/test
Round-trips: 1   Artifacts sent: 0  received: 0
Pull done, wire bytes sent: 441  received: 2118  ip: 5.161.138.46
New_Version: 09ea1b5d5b8d776d61a74bb412cd58bd8b6f82323c2f539a1eb0d915f7026f20
Sync with https://mer@somewhere.edu/test
Round-trips: 1   Artifacts sent: 2  received: 0
Sync done, wire bytes sent: 2496  received: 309  ip: 5.161.138.46

%fs timeline
=== 2022-10-01 ===
14:09:39 [09ea1b5d5b] *CURRENT* Naiveté. (user: mer tags: trunk)
--8<---------------cut here---------------end--------------->8---

Who is mangling my command-line arguments and why?  Thank you!