allow compose to generate code and ast in one command but to two different files

currently you have to run composer twice, once to generate the function code and again to generate the ast (needed for k/o-ui visualization).

it would be convenient to run `compose` once and specify two different files for output.

Start with the compose command and trace how its function-code and AST outputs are currently selected. Run the command in separate-output scenarios, then verify that one invocation can write the function code and AST to two different files for k/o-ui visualization.

Written by the indexing model from the issue text.