Source access enforcement (the catalog): 10-source catalog + per-scene access matrix enforced by SceneAccessPolicy; Add-Source menu is one ItemsSource rebuilt per scene (Screen = Live-only, BG/Image/Text every scene), webcam row always present + greys out; Chatbox/Alerts/Socials are inert SourceType rows ready for their features; Text queued as a ship step (countdown + credits modes); Monetization notes socialBar free = YouTube + 1, unlimited with the paid key (79 tests passing)

Models/Source.cs

@@ -3,13 +3,22 @@ using ytLive.Helpers;
 
 namespace ytLive.Models;
 
+/// <summary>
+/// The source catalog (see TASKS.md). Chatbox / Alerts / Socials are inert
+/// values until their features ship — the access-policy rows are live from
+/// today, the menu items arrive with the features. Countdown and Credits are
+/// NOT types: they're Text modes, gated by the same policy when Text ships.
+/// </summary>
 public enum SourceType
 {
     DisplayCapture,
     WindowCapture,
     Background,
     Image,
-    TextOverlay
+    TextOverlay,
+    Chatbox,
+    Alerts,
+    Socials
 }
 
 public enum ClipShape