fix: probe loads model before recording and shows signal levels

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

Sources/SstProbe/TranscribeProbe.swift

@@ -2,11 +2,29 @@ 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()
+    } catch {
+        print("mislukt:", error.localizedDescription)
+        return
+    }
+    print("Model klaar.")
+    for i in [3, 2, 1] {
+        print("\(i)...")
+        try? await Task.sleep(for: .seconds(1))
+    }
+    guard let samples = await recordSamples(seconds: 8) else { return }
+    let peak = samples.map { abs($0) }.max() ?? 0
+    print("samples: \(samples.count), piek: \(peak)")
+    let perSecond = stride(from: 0, to: samples.count, by: 16_000).map { start -> String in
+        let chunk = samples[start..<min(start + 16_000, samples.count)]
+        let rms = (chunk.reduce(0) { $0 + $1 * $1 } / Float(chunk.count)).squareRoot()
+        return String(format: "%.3f", rms)
+    }
+    print("RMS per seconde:", perSecond.joined(separator: " "))
+    do {
         let started = Date.now
         let text = try await transcriber.transcribe(samples)
         let elapsed = Date.now.timeIntervalSince(started)