shape-doctor.py: a .gitmodules section name that is not UTF-8 is looked up by its decoded form, so configured_url and kept_gitdir miss a Latin-1 member and the update line is handed over with no keep line #732

Goal: the doctor finds a member whose .gitmodules section name is not UTF-8 by that name's own bytes. That holds in configured_url and kept_gitdir as it does in gitmodules_entry. A member with a commit on its detached HEAD then gets its keep line under any locale.

Filed by lane openRepoShape-3 under v1.1.1, on Brett Heap's word of 2026-10-16T13:35:28Z ("yes create v1.1.1"). Lane 3's reviewer RV-c found it while reviewing #700 (#668), as S2. Main does the same under LC_ALL=C, so this is not a regression. #700 makes the two locales agree.

What happens. RV-c measured this on #700's head 6179e6a4:

• Set-up: a holder with a real submodule named caf\xe9 (Latin-1), a commit made on the submodule's detached HEAD, then git submodule deinit -f.
• The cause: shape-doctor.py: submodule_config and gitmodules_entry read a holder's .gitmodules through one git config -z --list, so a section name holding a space or a byte that is not UTF-8, or a url holding NEL or U+2028, gives the doctor the mount url git and make siblings use, under any locale (#668) #700 decodes the section name with replacement (shape-doctor.py:4460 at 6179e6a4). configured_url (:4506) and kept_gitdir (:4681) then look the member up as caf� and find nothing.
• Under C.UTF-8: checkout_reach gives ('checkout', None, …). The doctor hands over the update line with no keep line, so the commit survives only in the reflog. Main gives ('no-url', …) here.
• Under LC_ALL=C: main and shape-doctor.py: submodule_config and gitmodules_entry read a holder's .gitmodules through one git config -z --list, so a section name holding a space or a byte that is not UTF-8, or a url holding NEL or U+2028, gives the doctor the mount url git and make siblings use, under any locale (#668) #700 both give ('checkout', None, …).
• The ASCII control (cafe) gives ('checkout', (…/modules/cafe, 'aa29d244…', None), …), and the keep line is printed.

What to do:

• Keep the section name byte-faithful from the git config -z --list read through configured_url and kept_gitdir, for example with surrogateescape.
• Hand it to git as the same bytes.
• Pin the fix with the Latin-1 holder above, under a UTF-8 locale and under LC_ALL=C. The keep line must be printed in both, as it is for the ASCII control.

Lands after: #700.