Measure real CPU VAD on complete frozen media pool

tools/speech-vad/diagnostic.cpp

@@ -31,7 +31,9 @@ int main(int argc, char ** argv) {
     std::vector<float> samples(static_cast<size_t>(bytes) / 4);
     input.seekg(0);
     if (!input.read(reinterpret_cast<char *>(samples.data()), bytes)) return 2;
-    for (float sample : samples) if (!std::isfinite(sample) || std::abs(sample) > 1.0f) return 2;
+    // Float decoding may legitimately overshoot unity. Preserve source samples;
+    // clipping would change the experiment. Reject nonfinite input only.
+    for (float sample : samples) if (!std::isfinite(sample)) return 2;
     whisper_log_set(log_message, nullptr);
     auto context_params = whisper_vad_default_context_params();
     context_params.n_threads = 1;