Add examples/python/_shared/console.py with safe_print/icon helpers that
degrade emoji to ASCII on legacy Windows code pages (cp1252) instead of
crashing, mirroring the CLI _supports_unicode/_icon pattern. Wire the helper
into the high-severity gateway (16, 17, 18) and channel (20-23) examples so
they start on default Windows PowerShell without PYTHONUTF8.
Co-authored-by: Mervin Praison <[email protected]>