✅ Advance contract to main p2 first

Category	Ability
Status	Passing
Test	tests/test_turn_sequence.py::test_advance_contract_to_main_p2_first

advance_phase from CONTRACT when P2 goes first.

Preconditions

• phase = Phase.CONTRACT.

• main_phase_order = [Side.PLAYER_2, Side.PLAYER_1].

Action

• advance_phase(state)

Expected Postconditions

• phase = Phase.MAIN.

• current_player = Side.PLAYER_2.

Assertions

assert result.phase == Phase.MAIN
assert result.current_player == Side.PLAYER_2