To convert plain AppleScript file to a droplet, I can use
osacompile -o foo.app foo.applescript
My question: is it possible to use osacompile (or maybe there is another way, using command line) to convert plain AppleScript file (such as shown below) to Automator application instead?
on run {input, parameters}
(* Your script goes here *)
return input
end run
I‘m by far no expert in scripting - but no.
It’s because an AppleScript Applet/droplet is just a compiled script in a bundle.
An Automator-Application is by far more complicated because the AppleScript needs to be XML-Escaped and placed in a xml construct because Automator-Actions are based on XML.
What’s following afterwards is not clear to me but there’s some complex compiling involved before all gets bundled into an Application.
Maybe it’s part of Xcode‘s toolset that is involved… I don’t know…
Greetings from Germany 
Tobias