Function compute_inner_auth_wit_hash 

pub fn compute_inner_auth_wit_hash(args: &[Fr]) -> Fr

Compute the inner authwit hash — the “intent” before siloing with consumer.

args is typically [caller, selector, args_hash]. Uses Poseidon2 with AUTHWIT_INNER domain separator.

Mirrors TS computeInnerAuthWitHash(args).