Auto-record when Teams joins a meeting

New AutoRecordOnCall preference (DISPLAY tab). When checked, recording auto-flips ON the moment Teams transitions into a call (UIA Leave button appears in tree), and auto-flips OFF when the call ends.

Completes the unattended-show story: with Launch + AutoHide + AutoRecord all ticked, the operator launches TeamsISO and walks away — Teams runs invisibly, recording begins/ends with the meeting, ISOs route, all done. Toast surfaces each transition so they know what's happening if they glance at the screen.

Implementation: transition detection lives in the existing UIA-probe code in OnStatsTick. previousInCall != inCall gate prevents the auto-toggle from re-firing on every poll. Direct call to _controller.SetRecording + Settings.RecordIsosToDisk = ... so the existing recording infrastructure handles the rest. Toast for visibility, swallow-on-error so a recording config issue can't break the IN-CALL pill update path.

src/TeamsISO.App/MainWindow.xaml

@@ -1338,6 +1338,11 @@
                                           Margin="0,8,0,0"
                                           ToolTip="When checked, Teams' windows are hidden as soon as they materialize after launch. Use the eye-icon button in the rail to restore them when needed. Drives Teams via the IN-CALL bar (mute / camera / share / leave / marker) and the participants DataGrid for ISO routing."/>
 
+                                <CheckBox Content="Auto-record when Teams joins a meeting"
+                                          IsChecked="{Binding Settings.AutoRecordOnCall}"
+                                          Margin="0,8,0,0"
+                                          ToolTip="When checked, recording auto-starts the moment Teams transitions into a call (IN CALL pill goes cyan) and auto-stops when the call ends. Removes the manual Record toggle step from unattended-show workflows."/>
+
                                 <Separator Margin="0,16,0,8"/>
 
                                 <CheckBox Content="Record ISOs to disk"

src/TeamsISO.App/Services/UIPreferences.cs

@@ -45,7 +45,12 @@ public static class UIPreferences
         // background and its windows are auto-hidden as soon as they materialize.
         // All control happens via the IN-CALL bar + participants DataGrid.
         bool LaunchTeamsOnStartup = false,
-        bool AutoHideTeamsWindows = false);
+        bool AutoHideTeamsWindows = false,
+        // Auto-record on meeting start: when Teams transitions into a call
+        // (UIA Leave button appears), TeamsISO flips global recording on;
+        // when the call ends, recording stops. Pairs naturally with the
+        // headless workflow — operator never touches the recording toggle.
+        bool AutoRecordOnCall = false);
 
     public static Prefs Load()
     {

src/TeamsISO.App/ViewModels/GlobalSettingsViewModel.cs

@@ -36,6 +36,7 @@ public sealed class GlobalSettingsViewModel : ObservableObject
     private bool _controlSurfaceLanReachable;
     private bool _launchTeamsOnStartup;
     private bool _autoHideTeamsWindows;
+    private bool _autoRecordOnCall;
 
     public GlobalSettingsViewModel(IIsoController controller, ToastViewModel? toast = null)
     {
@@ -63,6 +64,7 @@ public sealed class GlobalSettingsViewModel : ObservableObject
         _controlSurfaceLanReachable = uiPrefs.ControlSurfaceLanReachable;
         _launchTeamsOnStartup = uiPrefs.LaunchTeamsOnStartup;
         _autoHideTeamsWindows = uiPrefs.AutoHideTeamsWindows;
+        _autoRecordOnCall = uiPrefs.AutoRecordOnCall;
 
         // Bring the auto-apply flag in from the presets store so the checkbox
         // reflects the user's prior choice when the settings panel opens.
@@ -255,7 +257,8 @@ public sealed class GlobalSettingsViewModel : ObservableObject
             MinimizeToTray: _minimizeToTray,
             ControlSurfaceLanReachable: _controlSurfaceLanReachable,
             LaunchTeamsOnStartup: _launchTeamsOnStartup,
-            AutoHideTeamsWindows: _autoHideTeamsWindows));
+            AutoHideTeamsWindows: _autoHideTeamsWindows,
+            AutoRecordOnCall: _autoRecordOnCall));
 
     /// <summary>
     /// Auto-launch the Microsoft Teams desktop client when TeamsISO starts.
@@ -289,6 +292,21 @@ public sealed class GlobalSettingsViewModel : ObservableObject
         }
     }
 
+    /// <summary>
+    /// When Teams transitions into a call, automatically enable recording;
+    /// when the call ends, stop. Removes the manual record-toggle step from
+    /// the headless workflow. Recording state changes are surfaced via the
+    /// existing toast + footer badge so the operator knows what's happening.
+    /// </summary>
+    public bool AutoRecordOnCall
+    {
+        get => _autoRecordOnCall;
+        set
+        {
+            if (SetField(ref _autoRecordOnCall, value)) PersistUiPrefs();
+        }
+    }
+
     /// <summary>
     /// Record each newly-enabled ISO's normalized output to disk under
     /// <see cref="RecordingDirectory"/>. Already-running ISOs are not retroactively

src/TeamsISO.App/ViewModels/MainViewModel.cs

@@ -693,10 +693,39 @@ public sealed class MainViewModel : ObservableObject, IDisposable
                         var title = inCall ? ExtractMeetingTitle(TeamsLauncher.GetActiveWindowTitle()) : null;
                         _dispatcher.InvokeAsync(() =>
                         {
+                            var previousInCall = IsTeamsInCall;
                             IsTeamsInCall = inCall;
                             TeamsMeetingState = inCall
                                 ? (string.IsNullOrEmpty(title) ? "IN CALL" : $"IN CALL · {title}")
                                 : "READY";
+
+                            // Auto-record on meeting transitions. False→True
+                            // turns recording on; True→False turns it off.
+                            // Guarded against repeating on every poll by
+                            // gating on the actual transition.
+                            if (Settings.AutoRecordOnCall && previousInCall != inCall)
+                            {
+                                if (inCall && !_controller.RecordingEnabled)
+                                {
+                                    try
+                                    {
+                                        _controller.SetRecording(true, Settings.RecordingDirectory);
+                                        Settings.RecordIsosToDisk = true;
+                                        Toast.Show("Auto-record: meeting started — recording ON");
+                                    }
+                                    catch { /* defensive — recording shouldn't block other state */ }
+                                }
+                                else if (!inCall && _controller.RecordingEnabled)
+                                {
+                                    try
+                                    {
+                                        _controller.SetRecording(false, null);
+                                        Settings.RecordIsosToDisk = false;
+                                        Toast.Show("Auto-record: meeting ended — recording OFF");
+                                    }
+                                    catch { /* defensive */ }
+                                }
+                            }
                         });
                     }
                     catch { /* UIA flakiness shouldn't crash the stats tick */ }