test: add pcm streaming smoke

apps/shared/ClawdisKit/Sources/ClawdisKit/PCMStreamingAudioPlayer.swift

@@ -89,9 +89,10 @@ public final class PCMStreamingAudioPlayer {
         }
 
         self.pendingBuffers += 1
-        self.player.scheduleBuffer(buffer) { [weak self] in
-            Task { @MainActor in
-                guard let self else { return }
+        Task.detached { [weak self] in
+            guard let self else { return }
+            await self.player.scheduleBuffer(buffer)
+            await MainActor.run {
                 self.pendingBuffers = max(0, self.pendingBuffers - 1)
                 if self.inputFinished && self.pendingBuffers == 0 {
                     self.finish(StreamingPlaybackResult(finished: true, interruptedAt: nil))

apps/shared/ClawdisKit/Tests/ClawdisKitTests/PCMStreamingAudioPlayerTests.swift

@@ -0,0 +1,26 @@
+import XCTest
+@testable import ClawdisKit
+
+final class PCMStreamingAudioPlayerTests: XCTestCase {
+    @MainActor
+    func testStopDuringPCMStreamReturnsInterruptedResult() async {
+        var continuation: AsyncThrowingStream<Data, Error>.Continuation?
+        let stream = AsyncThrowingStream<Data, Error> { cont in
+            continuation = cont
+            let samples = Data(repeating: 0, count: 44_100)
+            cont.yield(samples)
+        }
+
+        let task = Task { @MainActor in
+            await PCMStreamingAudioPlayer.shared.play(stream: stream, sampleRate: 44_100)
+        }
+
+        try? await Task.sleep(nanoseconds: 120_000_000)
+        let interruptedAt = PCMStreamingAudioPlayer.shared.stop()
+        continuation?.finish()
+
+        let result = await task.value
+        XCTAssertFalse(result.finished)
+        XCTAssertNotNil(interruptedAt)
+    }
+}