Maity: Board

hub: handover follow-ups — scan up to the first packet, fallback without exchange_seq, handover always in the first packet (after #786)

tsk-5xtc5mjq55zs done Maity Test Team (maity-test-team)

Follow-up to #786 (tsk-gdsxg2y2hqjc): dzse P3 and n3yv second point. PR #803. The open spec question (own acts of the chain as team items) stays with A for the contract.