Are Applescript dictionaries shareable or available without access to the app?
The AppleScript Dictionary, an XML file with a .sdef extension, for a given app is typically found within the application bundle, e,g. for iTerm2:

/Applications/iTerm.app/Contents/Resources/iTerm2.sdef


You can copy the .sdef file to your computer and open it in Script Editor.

That said, you may not be able to compile the script without the App installed, so debugging your code may be difficult.

A trick I've used, to just compile the code but not test the code, is to create a dummy application bundle of the target application. Just make a folder of the application's name with a .app extension.