mgba-0001: SM83DebuggerCheckBreakpoints() O(N) linear scan per GB/GBC
CPU instruction — no bloom filter guard, unlike ARMDebugger which already
has bpBloom[4]. Fix: add identical bloom guard to SM83Debugger.
Op-count ratio 10.4x at N=16 breakpoints (PASS).
snes9x: CLEAN across all 5 MOADs. Breakpoint array is fixed size-6 (O(1)).
Cheat apply is per-frame O(G*C), not per-instruction. No credential logging.
