Function compile_support_membrane 

pub fn compile_support_membrane(
    reqs: usize,
) -> Result<AdmissionProgram, ProgramError>

Compile the support membrane: admit iff every requirement’s enforcement is at least Mediated (2-bit codes 0 Unsupported, 1 Mediated, 2 Enforced).

Errors

ProgramError only on u32 node-index overflow, which a membrane never hits.