Windows: concore CLI crashes with UnicodeEncodeError when output is redirected #644

On Windows, when the output of any concore command is redirected or piped (scripts, CI logs, | findstr), Python writes stdout with the legacy code page (cp1252) and the CLI crashes on the first check mark:

> concore init demo > out.txt
UnicodeEncodeError: 'charmap' codec can't encode character '✓' in position 0: character maps to <undefined>

Exit code is 1. In an interactive console it works because rich writes through the console API.

The same happens on any OS with PYTHONIOENCODING=cp1252, which makes it easy to reproduce:
PYTHONIOENCODING=cp1252 python -c "from concore_cli.cli import cli; cli()" init demo > out.txt

I have a small fix with a test and will open a PR against dev.