ActorSystem: Fork AIs, DemoRootAI and queries are ksys

They form one run in the ActorSystem block (DemoRootAI at 0x7100d61e68,
right after VillagerMgr).

(AI assisted using Claude Fable 5.1 and Claude Opus 5.5)

src/KingSystem/ActorSystem/queryCheckJustBeforeEventCancel.cpp

@@ -0,0 +1,19 @@
+#include "KingSystem/ActorSystem/queryCheckJustBeforeEventCancel.h"
+#include <evfl/Query.h>
+
+namespace ksys::act::ai {
+
+CheckJustBeforeEventCancel::CheckJustBeforeEventCancel(const InitArg& arg) : Query(arg) {}
+
+CheckJustBeforeEventCancel::~CheckJustBeforeEventCancel() = default;
+
+// FIXME: implement
+int CheckJustBeforeEventCancel::doQuery() {
+    return -1;
+}
+
+void CheckJustBeforeEventCancel::loadParams(const evfl::QueryArg& arg) {}
+
+void CheckJustBeforeEventCancel::loadParams() {}
+
+}  // namespace ksys::act::ai