fix(audio): improve audio initialization and process termination handling

- Add retry logic for CGO audio initialization
- Enhance process termination checks in input supervisor
- Skip initialization check in cgo_audio to avoid compilation issues
- Add proper error handling for audio system initialization failures

internal/audio/cgo_audio.go

@@ -709,6 +709,9 @@ func cgoAudioReadEncode(buf []byte) (int, error) {
 		return 0, newBufferTooSmallError(len(buf), minRequired)
 	}
 
+	// Skip initialization check for now to avoid CGO compilation issues
+	// TODO: Add proper initialization state checking
+
 	n := C.jetkvm_audio_read_encode(unsafe.Pointer(&buf[0]))
 	if n < 0 {
 		return 0, newAudioReadEncodeError(int(n))

internal/audio/input_supervisor.go

@@ -141,7 +141,8 @@ func (ais *AudioInputSupervisor) Stop() {
 
 	// Try graceful termination first
 	if ais.cmd != nil && ais.cmd.Process != nil {
-		ais.logger.Info().Int("pid", ais.cmd.Process.Pid).Msg("Stopping audio input server subprocess")
+		pid := ais.cmd.Process.Pid
+		ais.logger.Info().Int("pid", pid).Msg("Stopping audio input server subprocess")
 
 		// Send SIGTERM
 		err := ais.cmd.Process.Signal(syscall.SIGTERM)
@@ -161,9 +162,17 @@ func (ais *AudioInputSupervisor) Stop() {
 		case <-time.After(GetConfig().InputSupervisorTimeout):
 			// Force kill if graceful shutdown failed
 			ais.logger.Warn().Msg("Audio input server subprocess did not stop gracefully, force killing")
-			err := ais.cmd.Process.Kill()
-			if err != nil {
-				ais.logger.Error().Err(err).Msg("Failed to kill audio input server subprocess")
+			// Check if process is still alive before attempting to kill
+			if ais.cmd != nil && ais.cmd.Process != nil {
+				// Check process state to avoid "process already finished" error
+				if ais.cmd.ProcessState == nil {
+					err := ais.cmd.Process.Kill()
+					if err != nil {
+						ais.logger.Error().Err(err).Msg("Failed to kill audio input server subprocess")
+					}
+				} else {
+					ais.logger.Info().Msg("Audio input server subprocess already finished")
+				}
 			}
 		}
 	}

internal/audio/output_streaming.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"runtime"
+	"strings"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -311,10 +312,18 @@ func StartAudioOutputStreaming(send func([]byte)) error {
 		return ErrAudioAlreadyRunning
 	}
 
-	// Initialize CGO audio capture
-	if err := CGOAudioInit(); err != nil {
+	// Initialize CGO audio capture with retry logic
+	var initErr error
+	for attempt := 0; attempt < 3; attempt++ {
+		if initErr = CGOAudioInit(); initErr == nil {
+			break
+		}
+		getOutputStreamingLogger().Warn().Err(initErr).Int("attempt", attempt+1).Msg("Audio initialization failed, retrying")
+		time.Sleep(time.Duration(attempt+1) * 100 * time.Millisecond)
+	}
+	if initErr != nil {
 		atomic.StoreInt32(&outputStreamingRunning, 0)
-		return err
+		return fmt.Errorf("failed to initialize audio after 3 attempts: %w", initErr)
 	}
 
 	ctx, cancel := context.WithCancel(context.Background())
@@ -341,7 +350,7 @@ func StartAudioOutputStreaming(send func([]byte)) error {
 			case <-ctx.Done():
 				return
 			default:
-				// Capture audio frame with enhanced error handling
+				// Capture audio frame with enhanced error handling and initialization checking
 				n, err := CGOAudioReadEncode(buffer)
 				if err != nil {
 					consecutiveErrors++
@@ -350,6 +359,13 @@ func StartAudioOutputStreaming(send func([]byte)) error {
 						Int("consecutive_errors", consecutiveErrors).
 						Msg("Failed to read/encode audio")
 
+					// Check if this is an initialization error (C error code -1)
+					if strings.Contains(err.Error(), "C error code -1") {
+						getOutputStreamingLogger().Error().Msg("Audio system not initialized properly, forcing reinitialization")
+						// Force immediate reinitialization for init errors
+						consecutiveErrors = maxConsecutiveErrors
+					}
+
 					// Implement progressive backoff for consecutive errors
 					if consecutiveErrors >= maxConsecutiveErrors {
 						getOutputStreamingLogger().Error().