Function write_vc_claim_quins 

pub fn write_vc_claim_quins(
    agent_did: u64,
    roles: &[u64],
    clearance: u8,
    issuer_did: u64,
    ts: u64,
) -> [NQuin; 3]

Build the NQuins that record a VC credential claim for an agent, for insertion into the daemon graph.

Each role_hash becomes a P_HAS_ROLE quin in CONTEXT. clearance and issuer_did emit one quin each.