feat: add fraud detection validator

packages/gateway/meshnet_gateway/server.py

@@ -147,10 +147,10 @@ class _GatewayHandler(http.server.BaseHTTPRequestHandler):
 
         text = node_resp["text"]
         model = body.get("model", "stub-model")
+        session_id = str(uuid.uuid4())
         if server.contracts is not None and route_nodes:
             api_key = _api_key_from_authorization(self.headers.get("Authorization"))
             if api_key:
-                session_id = str(uuid.uuid4())
                 tokens = max(1, _estimate_token_count(messages, text))
                 for node in route_nodes:
                     wallet_address = node.get("wallet_address")
@@ -165,6 +165,14 @@ class _GatewayHandler(http.server.BaseHTTPRequestHandler):
                         tokens=tokens,
                         speed_score=float(node.get("score", 1.0)),
                     )
+        if server.contracts is not None:
+            server.contracts.validation.record_completed_inference(
+                session_id=session_id,
+                model=model,
+                messages=messages if isinstance(messages, list) else [],
+                observed_output=text,
+                route_nodes=route_nodes,
+            )
 
         if streaming:
             self._send_sse_response(text, model)