refactor(processor): eliminate redundant interval accumulator reset call

- Remove post-declaration reset() call from AnalyzeAudio; struct zero
  values suffice for all fields except truePeakMax and samplePeakMax
- Collapse reset() body from 28 lines to 3 lines using struct literal
  initialization

This reduces unnecessary initialization overhead and improves code
clarity by relying on Go's zero-value semantics.

Signed-off-by: Martin Wimpress <code@wimpress.io>

Author: flexiondotorg

internal/processor/analyzer.go

@@ -326,7 +326,6 @@ func AnalyzeAudio(filename string, config *FilterChainConfig, progressCallback f
 	const intervalDuration = 250 * time.Millisecond
 	var intervals []IntervalSample
 	var intervalAcc intervalAccumulator
-	intervalAcc.reset() // Initialize with proper defaults
 	var intervalStartTime time.Duration
 
 	// Track input frame time (before filter graph, which upsamples to 192kHz)

internal/processor/analyzer_metrics.go

@@ -301,33 +301,10 @@ func (a *intervalAccumulator) finalize(timestamp time.Duration) IntervalSample {
 
 // reset clears the accumulator for the next interval.
 func (a *intervalAccumulator) reset() {
-	a.frameCount = 0
-
-	// Raw sample RMS and peak
-	a.rawSumSquares = 0
-	a.rawSampleCount = 0
-	a.rawPeakAbs = 0
-
-	// aspectralstats
-	a.spectralMeanSum = 0
-	a.spectralVarianceSum = 0
-	a.spectralCentroidSum = 0
-	a.spectralSpreadSum = 0
-	a.spectralSkewnessSum = 0
-	a.spectralKurtosisSum = 0
-	a.spectralEntropySum = 0
-	a.spectralFlatnessSum = 0
-	a.spectralCrestSum = 0
-	a.spectralFluxSum = 0
-	a.spectralSlopeSum = 0
-	a.spectralDecreaseSum = 0
-	a.spectralRolloffSum = 0
-
-	// ebur128
-	a.momentaryLUFSSum = 0
-	a.shortTermLUFSSum = 0
-	a.truePeakMax = -120.0
-	a.samplePeakMax = -120.0
+	*a = intervalAccumulator{
+		truePeakMax:   -120.0,
+		samplePeakMax: -120.0,
+	}
 }
 
 // Cached metadata keys for frame extraction - avoids per-frame C string allocations