feat(app): add POST /reset endpoint — starts new episode, returns ResetResponse

server/app.py

@@ -1,6 +1,7 @@
 from contextlib import asynccontextmanager
-from fastapi import FastAPI
+from fastapi import FastAPI, HTTPException
 from fastapi.middleware.cors import CORSMiddleware
+from models import ResetResponse
 from server.environment import RedTeamEnvironment
 from server.config import get_settings
 
@@ -37,3 +38,11 @@ app.add_middleware(
 @app.get("/health")
 async def health_check():
     return {"status": "healthy", "version": "0.1.0"}
+
+@app.post("/reset", response_model=ResetResponse)
+async def reset_episode():
+    try:
+        observation = await env.reset()
+        return ResetResponse(observation=observation, episode_id=observation.episode_id)
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))