NDI discovery

config/runtime-host.schema.json

@@ -67,6 +67,11 @@
       "exclusiveMinimum": 0,
       "default": 59.94,
       "description": "Target repaint rate for the optional preview window. It does not change render/output cadence."
+    },
+    "runtimeShaderId": {
+      "type": "string",
+      "default": "happy-accident",
+      "description": "Startup shader package id used when no saved runtime layer stack is restored."
     }
   },
   "required": [
@@ -178,20 +183,30 @@
           "default": "59.94",
           "description": "Output render cadence and video mode frame rate."
         },
+        "pixelFormat": {
+          "type": "string",
+          "enum": [
+            "auto",
+            "bgra8",
+            "uyvy8"
+          ],
+          "default": "auto",
+          "description": "Requested system-memory output pixel format. Auto uses UYVY8 for DeckLink/NDI unless Output alpha is enabled, then BGRA8."
+        },
         "keying": {
           "type": "object",
           "additionalProperties": false,
-          "description": "DeckLink keying options.",
+          "description": "Output alpha options. The control UI exposes these as a single Output alpha control.",
           "properties": {
             "external": {
               "type": "boolean",
               "default": false,
-              "description": "Requests DeckLink external keying when the selected output device supports it."
+              "description": "DeckLink external-keyer backing field. The control UI only writes this true for DeckLink output."
             },
             "alphaRequired": {
               "type": "boolean",
               "default": false,
-              "description": "Requires alpha-capable output format support during DeckLink output setup."
+              "description": "General output alpha request. When true, automatic output pixel-format selection uses an alpha-carrying system-frame format."
             }
           },
           "required": [