feat: Introduce explicit start, stop, and status commands, including minimum recording duration.

Core/TranscriptionOrchestrator.cs

@@ -58,6 +58,19 @@ public class TranscriptionOrchestrator : ITranscriptionOrchestrator
 
         Logger.LogDebug("Received STOP command");
         var config = _configProvider.LoadConfig();
+
+        var startTime = _stateTracker.GetRecordingStartTime();
+        if (startTime.HasValue)
+        {
+            var duration = (DateTime.UtcNow - startTime.Value).TotalMilliseconds;
+            if (duration < config.MinRecordingDuration)
+            {
+                Logger.LogDebug($"Recording duration {duration}ms is less than min {config.MinRecordingDuration}ms. Discarding.");
+                ProcessAbortAsync();
+                return;
+            }
+        }
+
         _notifications.PlaySound(config.StopSoundPath);
         _notifications.Notify("Toak", "Transcribing...");