feat: add WhisperKit transcriber and transcribe probe

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

Sources/SstProbe/TranscribeProbe.swift

@@ -0,0 +1,17 @@
+import Foundation
+import SstWhisper
+
+func runTranscribeProbe() async {
+    guard let samples = await recordSamples(seconds: 6) else { return }
+    print("Model laden (eerste keer: download ≈1.5 GB)…")
+    let transcriber = WhisperKitTranscriber()
+    do {
+        try await transcriber.load()
+        let started = Date.now
+        let text = try await transcriber.transcribe(samples)
+        let elapsed = Date.now.timeIntervalSince(started)
+        print(String(format: "(%.2f s) ", elapsed) + text)
+    } catch {
+        print("mislukt:", error.localizedDescription)
+    }
+}

Sources/SstProbe/main.swift

@@ -6,6 +6,8 @@ case "hotkey":
     runHotkeyProbe()
 case "record":
     await runRecordProbe()
+case "transcribe":
+    await runTranscribeProbe()
 default:
-    print("usage: sst-probe hotkey|record")
+    print("usage: sst-probe hotkey|record|transcribe")
 }