feat: add menu bar app and bundle script

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Sources/SstCore/AudioRecorder.swift

@@ -31,6 +31,7 @@ public final class AudioRecorder: AudioRecording {
         }
         let ratio = targetFormat.sampleRate / inputFormat.sampleRate
 
+        input.removeTap(onBus: 0)
         input.installTap(onBus: 0, bufferSize: 4096, format: inputFormat) { [weak self] pcm, _ in
             guard let self else { return }
             let capacity = AVAudioFrameCount(Double(pcm.frameLength) * ratio) + 1
@@ -52,7 +53,12 @@ public final class AudioRecorder: AudioRecording {
             self.lock.withLock { self.buffer.append(contentsOf: samples) }
         }
         engine.prepare()
-        try engine.start()
+        do {
+            try engine.start()
+        } catch {
+            input.removeTap(onBus: 0)
+            throw error
+        }
     }
 
     public func stop() -> [Float] {