refactor(domain): reshape the game to pure deciders in vertical slices (#301)#307

Merged

david-acm merged 10 commits into

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claude/issue-301-decider-slices

Jul 6, 2026

Commits on Jul 6, 2026

test(start): pure decider tests for the StartGame slice (red)
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feat(start): extract the StartGame decider; aggregate delegates to it (green)
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test(join,begin): pure decider tests for JoinPlayer + BeginGame slices (red)
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feat(join,begin): extract JoinPlayer + BeginGame deciders; add pure GameState.Fold (green)
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test(roll,selection): pure decider tests for RollDice/SetDiceAside/ReturnDice (red)
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feat(roll,selection): extract RollDice/SetDiceAside/ReturnDice deciders (green)
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test(keep,pass): pure decider tests for KeepDice + PassTurn slices (red)
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feat(keep,pass): extract KeepDice + PassTurn deciders; add HasActedThisTurn state (green)
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test(arch): guard decider purity and slice inward-only dependencies (#301)
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docs(decisions): record the decider/slice and stream-identity decisions (#301)
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