Contract 6.16.0

A duel can answer for its own rounds, and a battle says whether you met a ranked opponent.

• battles_query rows carry rounds[] on a duel: each GAME's own crowns, tower_hp and elixir - including a per-round differential, which the summed top-level counter cannot have - on the round numbers deck.rounds[] already used, so a round's deck and its result line up. The API has always reported these; Elixir recorded the round DECKS and discarded the round RESULTS, and said so in the docs as if it were a property of duels. 20,218 round rows across 4,362 duels were filled back from the payload archive.
• global_rank on every participant of every row: the player's global leaderboard position as the API reported it ON that battle, null unless they were ranked then. 129,162 rows carry one, range 1-500.

Additive. Both ride full verbosity only; compact is unchanged.