feat(app): add GET /history endpoint — returns full attack_history list

server/app.py

@@ -60,3 +60,7 @@ async def step_episode(action: AttackAction):
 @app.get("/state", response_model=EpisodeState)
 async def get_state():
     return env.get_state()
+
+@app.get("/history")
+async def get_history():
+    return {"history": env.get_history()}