Add subroutine selection

Update the code coverage generator to contain subroutines to insert break points.

This should only add break points to the relevant subroutines - if *ALL in the list - use all.

If adding certain subroutines - remove *ALL.

Locate the code coverage generator and the existing breakpoint-insertion logic, then trace how the subroutine list is represented. Implement selection so only listed subroutines receive breakpoints, while *ALL selects every subroutine and is removed when specific subroutines are chosen. Confirm the generated coverage output contains breakpoints only for the requested subroutines.

Written by the indexing model from the issue text.