feat: add AudioRecorder (16 kHz mono) and record probe

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

Sources/SstProbe/RecordProbe.swift

@@ -0,0 +1,24 @@
+import AVFoundation
+import SstCore
+
+/// Records `seconds` of microphone audio; returns nil if access is denied or recording fails.
+func recordSamples(seconds: Double) async -> [Float]? {
+    guard await AVCaptureDevice.requestAccess(for: .audio) else {
+        print("Microfoon-toegang geweigerd (Systeeminstellingen → Privacy → Microfoon).")
+        return nil
+    }
+    let recorder = AudioRecorder()
+    do { try recorder.start() } catch {
+        print("start mislukt:", error.localizedDescription)
+        return nil
+    }
+    print("Neem \(Int(seconds)) s op — praat nu")
+    try? await Task.sleep(for: .seconds(seconds))
+    return recorder.stop()
+}
+
+func runRecordProbe() async {
+    guard let samples = await recordSamples(seconds: 3) else { return }
+    let peak = samples.map { abs($0) }.max() ?? 0
+    print("samples: \(samples.count) (verwacht ≈ 48000), piek: \(peak)")
+}

Sources/SstProbe/main.swift

@@ -4,6 +4,8 @@ let command = CommandLine.arguments.dropFirst().first ?? "help"
 switch command {
 case "hotkey":
     runHotkeyProbe()
+case "record":
+    await runRecordProbe()
 default:
-    print("usage: sst-probe hotkey")
+    print("usage: sst-probe hotkey|record")
 }