play-0001: CIopBios::FindIntrHandler() O(H) linear scan per IOP interrupt.
Called from HandleInterrupt() thousands of times per second. Fix: direct
index array m_intrHandlerIndex[LINES_MAX] keyed by interrupt line -> O(1).
Algorithmic ratio 32x (H=MAX_INTRHANDLER=32), timing 5.6x. 5/5 PASS.
Basilisk II: all 5 MOADs CLEAN. Video/newcpu lookuptab searches are cold
paths only; no god object, thread_local identity, credential logging, or
unsynchronized cache patterns found.
