mundane

Core model

Execution model

The engine is a referee, not a player. The whole game is a fold over a stream of actions:

final_state = reduce(apply_action, actions, initial_state)

apply_action(state, action) is the only function that mutates the game. It validates the action against the current state, then transitions it.

• Validation happens before any mutation. An action that fails any precondition is rejected: the engine raises IllegalAction and the state is left exactly as it was.
• There is no other door: nothing changes the game except a successful apply_action.

Composure — winning and losing

Composure is a household’s life total. Each player starts at 20.

• When any player’s Composure is 0 or below, their opponent wins.
• Once a winner is decided the game is over, and every subsequent action is rejected with “the game is over”.

Time — the resource

Time is spent to play cards.

• Every card has an integer cost. Playing a card spends that much Time.
• A player MUST have time >= cost; overspending is rejected with “not enough Time (have/cost)”.
• The active player’s Time refreshes to 5 during Wake Up housekeeping (see turn-priority.md).

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