First release: complete forced-joker Yahtzee rules, a multiplayer state machine with deterministic dice injection, a heuristic bot (mean 216.0), and an exact expectimax solver — 254.5877 expected points from the empty card under the official rules, reproducing Verhoeff's 254.5896 under his unforced joker convention. Play it in the browser with the solver as a live advisor: https://jdh8.github.io/yahtzee-engine/
See CHANGELOG.md for details.