Replay: deterministic record & playback (#4)

Add deterministic record/playback for a run.

Recording captures `(seed, config hash, ordered tick-tagged commands)` and re-simulates on playback — no state snapshots. `DotaFactory.exe --replay <file>` re-plays a recorded run view-only with manual speed/pause.

Reviewed-on: #4
Co-authored-by: Malte Langkabel <malte.langkabel@gmail.com>
Co-committed-by: Malte Langkabel <malte.langkabel@gmail.com>

src/lib/eventsystem/event/CMakeLists.txt

@@ -27,6 +27,7 @@ SET(HDRS
 	${CMAKE_CURRENT_SOURCE_DIR}/ArenaInspectRequestedEvent.h
 	${CMAKE_CURRENT_SOURCE_DIR}/BeamFiredEvent.h
 	${CMAKE_CURRENT_SOURCE_DIR}/DebugDrawToggledEvent.h
+	${CMAKE_CURRENT_SOURCE_DIR}/CommandRequestedEvent.h
 	PARENT_SCOPE
 )
 

src/lib/eventsystem/event/CommandRequestedEvent.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <memory>
+
+#include "Event.h"
+
+struct Command;
+
+// UI fan-in for the command path: widgets emit this with a built command, and a
+// single subscriber (GameWorldView) enqueues it onto the CommandManager. This
+// keeps widgets decoupled (consistent with the rest of the UI), while the
+// sim-mutating command itself is routed through the dedicated CommandManager
+// queue rather than the EventManager bus (see docs/replay_design.md).
+class CommandRequestedEvent : public Event
+{
+public:
+    explicit CommandRequestedEvent(std::shared_ptr<const Command> command)
+        : command(std::move(command))
+    {
+    }
+
+    const std::shared_ptr<const Command> command;
+};