Implement the two-player card game War

Implement the two-player card game War. Model a standard 52-card deck, deal it evenly between two players, then play rounds: each player reveals their top card and the higher card wins both. On a tie ("war"), each player lays cards face-down and reveals again to break the tie. Play until one player holds all cards (or a turn limit is reached), then report the winner.

Related variant also asked: a two-part array problem — model a deck as an array and implement shuffle/deal logic (part 1), then a harder extension such as dealing fairly among N players so counts differ by at most one, or transforming the array under a rule (part 2).