Function full_attribution 

pub fn full_attribution(
    data_hash: u64,
    worker_did: u64,
    activity_hash: u64,
    ts: u64,
) -> [NQuin; 3]

Full PROV-O labor attribution: creator + source + generated-at.

Returns 3 quins in PROVENANCE_CONTEXT:

• dcterms:creator = worker DID hash
• prov:wasAttributedTo = worker DID hash
• prov:wasGeneratedBy = activity hash