refactor: harden diagnostics and consolidate runtime code

audit/internal/platform/benchmark_analysis.go

@@ -525,13 +525,6 @@ func scoreBenchmarkGPUResult(gpu BenchmarkGPUResult) BenchmarkScorecard {
 	return score
 }
 
-// compositeBenchmarkScore is kept for compatibility with legacy callers.
-// CompositeScore = ComputeScore (no quality multiplier; throttling already
-// reduces TOPS directly, so no additional penalty is needed).
-func compositeBenchmarkScore(score BenchmarkScorecard) float64 {
-	return score.ComputeScore
-}
-
 // serverQualityScore returns a 0–100 score reflecting server infrastructure
 // quality, independent of GPU model or compute speed.
 //