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* fix(scripts): keep sync_labels.py from crashing on non-UTF-8 stdio The ✓ / ✗ status glyphs and the em dash in the Done line crashed the sync with UnicodeEncodeError whenever stdout was redirected on a host whose stdio encoding cannot represent them (Windows code pages, POSIX C locale, PYTHONIOENCODING=ascii) — after `gh label create --force` had already run, leaving a half-applied sync and a traceback. gh's UTF-8 diagnostics were additionally decoded with the host locale, mangling failure messages. Closes #7389. - Reconfigure stdout/stderr in main(): UTF-8 with backslashreplace when redirected, backslashreplace only on consoles. - Decode the gh subprocess as UTF-8 with errors="replace", matching scripts/support_bundle.py's _run_command. - Add backend/tests/test_sync_labels_script.py: hermetic offline cases (stub yaml, stub gh) running the real script under PYTHONIOENCODING=ascii for the success path, a UTF-8 gh failure, and --dry-run. All three go red on the unfixed script. * style(tests): fix sync-labels regression lint * docs(scripts): document label sync encoding policy --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>