✅ Mammon transfers to p2 at p2 phase start

Category	Ability
Status	Passing
Test	tests/test_abilities_complex.py::TestMammonTransferControl::test_mammon_transfers_to_p2_at_p2_phase_start

P1 owns Mammon. P2's main phase starts — Mammon transfers to P2.

Preconditions

• P1 owns Mammon (#053) in lane 1, READIED.

• P2's main phase is starting.

Action

• Fire MAIN_PHASE_START with side=P2.

Expected Postconditions

• Mammon.owner = P2 (was P1)

Assertions

assert mammon_after.owner == Side.PLAYER_2