shape-doctor.py: every non-ASCII character in a path it prints becomes ?, so a NEXT or keep line naming such a path (a member café, a holder under Projets/Équipe) cannot be pasted as printed #785

Goal: every command the doctor prints, as a NEXT, a keep line or a WHY, runs as printed when a path it names holds a non-ASCII character. This applies to the table and to --json alike, 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 measured it while reviewing #774 (#732), as SHOULD 1 (#774 (comment)). Main behaves the same for UTF-8 names, so it is not a regression of #774.

What happens (measured on #774's head 311ad7d9 and on main):

• The holder: a member named café (UTF-8, caf\xc3\xa9) or caf\xe9 (Latin-1), with a commit on its detached HEAD, then deinit -f.
• The doctor's keep line, in all six runs (each name under a UTF-8 locale, under LC_ALL=C, and under LC_ALL=C PYTHONUTF8=0): git --git-dir='…/.git/modules/members/caf?' branch <name> <commit>, or caf??.
• Where it shows: the table and --json alike.
• What it does: that path does not exist, so the pasted line fails.
• Why: the doctor flattens every non-ASCII character to ?, even é under a UTF-8 locale where the terminal could show it.

What to find and fix:

• Find where the doctor replaces non-ASCII characters (an ascii/replace encode, or a quoting helper). It may have been put in on purpose, for terminals that cannot print them, or for Windows consoles.
• Keep a printed command runnable:
  • quote the path with the platform's quoting (quote_arg and the POSIX quoting the doctor already uses for paste lines);
  • give --json the real characters, since JSON can carry them, or \u escapes that decode to them;
  • let the table print them where the output encoding can, falling back to a quoted form a shell turns back into the same bytes (for example POSIX $'\303\251').
• A path that is not UTF-8 needs bytes-faithful quoting: surrogateescape back to bytes, then $'\xe9'.

Tests:

• a member and a holder path with a UTF-8 non-ASCII name;
• the same with a Latin-1 name;
• each pasted line run as printed, under a UTF-8 locale and under LC_ALL=C;
• the --json values checked against the real path.

Note: #774 (#732) and #775 (#733) touch the same .gitmodules reading. This issue is about printing, so it can land after them.