This works:
display dialog "hello world"
but this doesn’t even compile:
use framework "Foundation"
display dialog "hello world"
Instead you have to do this:
use scripting additions
use framework "Foundation"
display dialog "hello world"
Why is that?
If you include any use statement, scripting additions are ignored unless specifically included via a use scripting additions statement. That’s just the way it has been designed – it provides an option to leave out additions terminology (because of a conflict, for example).