PowerShell 5.1 (used by IME) reads scripts without BOM as ANSI,
corrupting UTF-8 multi-byte chars (em-dashes, Unicode symbols) and
causing cascading parse errors that prevented agent installation.
Replaced all non-ASCII characters with ASCII equivalents in both
Install and Uninstall bootstrap scripts.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>