Windows hands a redirected or legacy console stream the ANSI code page
(cp1252), which cannot encode Rich's panels or the model's text: one
check mark in a finding ended a headless run with UnicodeEncodeError, and
the error handler raised again rendering its own panel. Reconfigure both
streams to UTF-8 at startup on win32, and open the Go TUI's os.devnull
sink as UTF-8 so logging into it stops producing --- Logging error ---
reports under the same code page.
