Checkpoint 4: harden native paths, authoring workflows and Player lifecycle

tests/player_diagnostics/Gameplay.cpp

@@ -0,0 +1,16 @@
+#include "Gameplay.hpp"
+#include <stdexcept>
+
+namespace faset::gameplay {
+void registerGameplay(runtime::Runtime& runtime) {
+    runtime::Behavior behavior;
+    behavior.onStart = [](auto&, auto, double) { throw std::runtime_error("TEST_ON_START"); };
+    behavior.update = [](auto&, auto, double) { throw std::runtime_error("TEST_UPDATE"); };
+    behavior.onDestroy = [](auto&, auto, double) { throw std::runtime_error("TEST_ON_DESTROY"); };
+    runtime.registerBehavior("test.diagnostics", std::move(behavior));
+}
+nlohmann::json schema() {
+    return nlohmann::json::array(
+        {{{"id", "test.diagnostics"}, {"version", 2}, {"fields", nlohmann::json::object()}}});
+}
+} // namespace faset::gameplay

tests/player_diagnostics/Gameplay.hpp

@@ -0,0 +1,7 @@
+#pragma once
+#include <faset/runtime/Runtime.hpp>
+
+namespace faset::gameplay {
+void registerGameplay(runtime::Runtime& runtime);
+nlohmann::json schema();
+} // namespace faset::gameplay