Cleanup: removed redundant code

internal/audio/sized_buffer_pool.go

@@ -1,53 +0,0 @@
-package audio
-
-import (
-	"sync"
-)
-
-// SimpleBufferPool manages a pool of fixed-size buffers
-// Analysis shows 99% of requests are for maxPCMBufferSize, so we simplify to fixed-size
-type SimpleBufferPool struct {
-	pool sync.Pool
-}
-
-// NewSimpleBufferPool creates a new simple buffer pool for fixed-size buffers
-func NewSimpleBufferPool(bufferSize int) *SimpleBufferPool {
-	return &SimpleBufferPool{
-		pool: sync.Pool{
-			New: func() interface{} {
-				buf := make([]byte, 0, bufferSize)
-				return &buf
-			},
-		},
-	}
-}
-
-// Get returns a buffer from the pool
-func (p *SimpleBufferPool) Get() []byte {
-	poolObj := p.pool.Get()
-	switch v := poolObj.(type) {
-	case *[]byte:
-		if v != nil {
-			buf := *v
-			return buf[:0] // Reset length but keep capacity
-		}
-	case []byte:
-		return v[:0] // Handle direct slice for backward compatibility
-	}
-	// Fallback for unexpected types or nil
-	return make([]byte, 0) // Will be resized by caller if needed
-}
-
-// Put returns a buffer to the pool
-func (p *SimpleBufferPool) Put(buf []byte) {
-	if buf == nil {
-		return
-	}
-	// Clear and reset the buffer
-	buf = buf[:0]
-	// Use pointer to avoid allocations as recommended by staticcheck
-	p.pool.Put(&buf)
-}
-
-// Global simple buffer pool - sized for maxPCMBufferSize since that's 99% of usage
-var GlobalBufferPool *SimpleBufferPool