Checkpoint 1: implement native subsystems and begin the gameplay manual

include/faset/render/render_graph.hpp

@@ -0,0 +1,20 @@
+#pragma once
+#include <functional>
+#include <string>
+#include <vector>
+namespace faset::render {
+// Ordered single-queue graph. Reads must be imported or produced by an earlier pass.
+// The Vulkan executor performs barriers at each resource state transition.
+class RenderGraph {
+public:
+    using Callback = std::function<void()>;
+    void import(std::string resource);
+    void add(std::string name, std::vector<std::string> reads, std::vector<std::string> writes, Callback execute);
+    void execute() const;
+    std::vector<std::string> pass_names() const;
+private:
+    struct Pass {std::string name; std::vector<std::string> reads, writes; Callback callback;};
+    std::vector<std::string> imports_;
+    std::vector<Pass> passes_;
+};
+}