✅ End main phase increments phase counter before expiry

Category	Regression
Status	Passing
Test	tests/test_turn_sequence.py::test_end_main_phase_increments_phase_counter_before_expiry

Regression (confusion #1): phase_counter increment BEFORE expire call.

Preconditions

• phase_counter = 3.

• Status effect with expires_phase = 3.

Action

• end_main_phase(state, P1)

Expected Postconditions

• phase_counter = 4 (incremented first).

• Status effect is gone (4 > 3, so expires).

Assertions

assert result.phase_counter == 4
assert len(result.status_effects) == 0