fix: Address linting errors in audio code

- Check SetReadDeadline error in IPC client
- Explicitly ignore Kill() error (process may be dead)
- Remove init() function and rely on explicit ExtractEmbeddedBinaries() call

internal/audio/embed.go

@@ -78,13 +78,3 @@ func GetAudioOutputBinaryPath() string {
 func GetAudioInputBinaryPath() string {
 	return audioInputBinPath
 }
-
-// init ensures binaries are extracted when package is imported
-func init() {
-	// Extract binaries on package initialization
-	// This ensures binaries are available before supervisors start
-	if err := ExtractEmbeddedBinaries(); err != nil {
-		// Log error but don't panic - let caller handle initialization failure
-		fmt.Fprintf(os.Stderr, "Warning: Failed to extract embedded audio binaries: %v\n", err)
-	}
-}

internal/audio/ipc.go

@@ -109,7 +109,9 @@ func (c *IPCClient) ReadMessage() (uint8, []byte, error) {
 	}
 
 	// Set read deadline
-	c.conn.SetReadDeadline(time.Now().Add(readTimeout))
+	if err := c.conn.SetReadDeadline(time.Now().Add(readTimeout)); err != nil {
+		return 0, nil, fmt.Errorf("failed to set read deadline: %w", err)
+	}
 
 	// Read 9-byte header
 	var header [ipcHeaderSize]byte

internal/audio/supervisor.go

@@ -81,7 +81,7 @@ func (s *Supervisor) Stop() {
 
 	// Kill process if running
 	if s.cmd != nil && s.cmd.Process != nil {
-		s.cmd.Process.Kill()
+		_ = s.cmd.Process.Kill() // Ignore error, process may already be dead
 	}
 
 	// Wait for supervision loop to exit