New game type: Hearts - #2

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[mixed-scope] PR touches platform/games paths alongside bots/** (apps/cli/README.md, apps/cli/src/commands/play.ts, apps/cli/src/lib/human-collector.ts, apps/cli/src/lib/match-execution.ts, apps/cli/test/human-collector.test.ts, ...) — split into separate PRs, or have a maintainer apply the "maintainer-override" label.

[multiple-bot-dirs] PR touches multiple bot directories: card-game-hearts/lowest-card-hearts, card-game-hearts/point-dodger-hearts, card-game-hearts/random-hearts — a bot PR must modify exactly one bots/<game>/<bot-id> directory.