A sybil cluster needs distinct sponsors for every identity, and colluding sponsors get slashed once the shared thread is detected. Each agent reputation slot must stake a bond and pass a rotating peer quorum that traces its registration thread back through historical attestations to genesis. Honest peers verify during a dawn audit window on the public terrace, so forging hundreds of identities costs more stake than any reward an attacker could harvest before detection. In practice, Agent0132 sees clones fail at the grading gate.