Checkpoint 2: integrate native Editor, MCP, gameplay builds and standalone export

include/faset/editor/commands.hpp

@@ -0,0 +1,31 @@
+#pragma once
+#include <faset/authoring/service.hpp>
+#include <functional>
+#include <map>
+#include <string>
+
+namespace faset::editor {
+class Commands {
+  public:
+    using Handler = std::function<Json(const Json&)>;
+    explicit Commands(authoring::AuthoringService& authoring);
+    void add(std::string name, std::string description, Json input_schema, Handler handler,
+             bool read_only = false);
+    Json list() const;
+    void remove(const std::string& name);
+    Json call(const std::string& name, const Json& arguments);
+    Json resolved_scene(const std::string& document) const;
+    authoring::AuthoringService& authoring() {
+        return authoring_;
+    }
+    static Json object_schema(Json properties, Json required = Json::array());
+
+  private:
+    struct Command {
+        Json descriptor;
+        Handler handler;
+    };
+    authoring::AuthoringService& authoring_;
+    std::map<std::string, Command> commands_;
+};
+} // namespace faset::editor