Gemini CLI v0.64.0 is released with CLI and ACP fixes

Google's Gemini CLI releases v0.64.0, with fixes to settings migration, ACP usage reporting, headless folder trust, file tool writes, and Ctrl+C handling. The release notes list a series of bug fixes, including Windows ConPTY IME cursor forwarding and extension update directory removal. A follow-up patch, v0.64.0-preview.1, cherry-picks one fix to release/v0.64.0-preview.0.