The Windows Encoding Trap: Why Claude Code Hooks Silently Fail on Non-ASCII Characters

Windows PowerShell 5.1's default encoding silently corrupts non-ASCII characters in Claude Code hooks, disabling automation logic without warning or error. For developers using Korean, Chinese, or other non-Latin scripts, this silent failure is particularly insidious since standard code validation passes completely. Understanding this platform-specific UTF-8 BOM issue is essential knowledge for anyone building multi-language Claude Code automation.