install-context-menu.bat / uninstall-context-menu.bat add a per-user (HKCU)
Explorer entry for .app and .opt files, with an embedded unpack icon
(assets/fsdecrypt.ico). No admin needed; the normal double-click association is
untouched. The registered command keeps the console open after extraction.
Documented in the README.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
