Add root endpoint for HF Spaces compatibility

app.py

@@ -18,6 +18,23 @@ def get_env(task_name: str = "spam_detection") -> EmailTriageEnv:
         environments[task_name] = EmailTriageEnv(task_name=task_name)
     return environments[task_name]
 
+@app.route("/", methods=["GET"])
+def index():
+    """Root endpoint - Space status page"""
+    return jsonify({
+        "status": "ok",
+        "message": "Email Triage OpenEnv API",
+        "version": "1.0.0",
+        "endpoints": {
+            "health": "GET /health",
+            "tasks": "GET /tasks",
+            "reset": "POST /reset?task=spam_detection",
+            "step": "POST /step?task=spam_detection",
+            "state": "GET /state?task=spam_detection",
+            "state-describe": "GET /state-describe?task=spam_detection"
+        }
+    }), 200
+
 @app.route("/health", methods=["GET"])
 def health():
     """Health check endpoint"""