docs(sdk): feedback visible via windows.open + séparation Codex skills documentées — commands-and-feedback (surface normative + exemple), layouts-react (type↔contributes.layouts, capacité ui), manifest (exemple complet menu+layout+ui), windows (contrat ui, retour structuré), packaging-distribution (idea_plugin_install_from_directory, sémantique plugin_reloaded/ESM), nouveau codex-skills-and-idea-plugins, README (lien) — #280 QA verte

docs/layouts-react.md

@@ -32,6 +32,26 @@ ctx.layouts?.register({
 });
 ```
 
+The `type` must exactly match one entry in `contributes.layouts`. The host
+rejects registrations for undeclared layout types. A plugin that opens this
+layout for human feedback must also declare the `ui` capability so the UI
+runtime and window services are part of the public contract.
+
+```json
+{
+  "capabilities": ["ui", "tooling"],
+  "contributes": {
+    "layouts": [
+      {
+        "type": "hello-plugin.dashboard",
+        "label": "Dashboard",
+        "component": "Dashboard"
+      }
+    ]
+  }
+}
+```
+
 ## Props
 
 - `projectId`: project hosting the layout.