perf(#52): cache average gate error rates in CostModel - #104
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_avg_single_qubit_error and _avg_two_qubit_error recomputed averages from device dictionaries on every call. For a circuit with N gates, this meant N redundant list/dict iterations. Fix: Cache the computed averages on first call, returning the cached value on subsequent calls.
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Caches and results on first call instead of recomputing from device dictionaries on every gate. All 351 tests pass.