Fix cross-session round hijacking and idempotent end-round penalties#9

Copilot wants to merge 3 commits intofix/prodString-sg/live-game:fix/prodfrom

copilot/sub-pr-1-0e85d75a-596d-453c-840d-1904d10754e9String-sg/live-game:copilot/sub-pr-1-0e85d75a-596d-453c-840d-1904d10754e9Copy head branch name to clipboard