perf(npm-lock-graph): use Set accumulators for edge lists#652
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…raph construction from O(E*V) to O(E) Refs #645
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Replace spread-array accumulation with Set-based accumulators during npm lock graph construction. Reduces graph construction from O(E×V) to O(E).
Before:
unique([...(map.get(key) ?? []), newId])on every edge — O(n) per insertAfter:
set.add(newId)— O(1) per insert, converted to array once at endRefs #645