- Set UTF-8 environment variables (PYTHONUTF8, PYTHONIOENCODING, LANG, LC_ALL) on all child processes via process.rs helpers - Configure PTY terminals per shell flavor: chcp 65001 for cmd.exe, [Console]::OutputEncoding for PowerShell, LANG=C.UTF-8 for Git Bash - Use /K and -NoExit for interactive shells to avoid nested processes Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>