lives_decremented + ghost_collision_death asserted; the death pipeline is now a mechanical contract

G-A2600-002 AC#2 and AC#4 close-out. New evaluator evaluate_ghost_collision_death in oracles/mechanical_oracle.py: every [CXRD] consumed-collision event (the game READ CXPPMM bit7 set — the F118 read-hit telemetry) must be followed by a lives decrement in [PAC] within max_lag=300 frames (timing basis F119/F121: ~125f death freeze + up to ~130f $F500 DEC $E4 cadence before $F53E lands).

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