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

Core/DaemonService.cs

@@ -140,6 +140,28 @@ public static class DaemonService
                     else
                         await orchestrator.ProcessStartRecordingAsync();
                 }
+                else if (cmd == 5) // STATUS
+                {
+                    bool json = pipeToStdout; // buffer[1] == 1 is json
+                    bool isRecording = stateTracker.IsRecording();
+                    string stateStr = isRecording ? "Recording" : "Idle";
+                    
+                    if (json)
+                    {
+                        var start = stateTracker.GetRecordingStartTime();
+                        double durationMs = 0;
+                        if (isRecording && start.HasValue)
+                        {
+                            durationMs = (DateTime.UtcNow - start.Value).TotalMilliseconds;
+                        }
+                        var jsonStr = $"{{\"state\": \"{stateStr}\", \"duration\": {Math.Round(durationMs)}}}";
+                        await client.SendAsync(System.Text.Encoding.UTF8.GetBytes(jsonStr), SocketFlags.None);
+                    }
+                    else
+                    {
+                        await client.SendAsync(System.Text.Encoding.UTF8.GetBytes(stateStr), SocketFlags.None);
+                    }
+                }
             }
         }
         catch (Exception ex)