fix(deepseek): backfill v4 assistant reasoning replay

extensions/venice/index.test.ts

@@ -55,6 +55,7 @@ describe("venice provider plugin", () => {
               },
             ],
           },
+          { role: "assistant", content: "done" },
         ],
       };
       (options as { onPayload?: (payload: Record<string, unknown>) => void })?.onPayload?.(payload);
@@ -87,6 +88,11 @@ describe("venice provider plugin", () => {
             ],
             reasoning_content: "",
           },
+          {
+            role: "assistant",
+            content: "done",
+            reasoning_content: "",
+          },
         ],
       },
     ]);

extensions/venice/stream.ts

@@ -18,7 +18,7 @@ function ensureVeniceDeepSeekV4Replay(payload: Record<string, unknown>): void {
       continue;
     }
     const record = message as Record<string, unknown>;
-    if (record.role === "assistant" && Array.isArray(record.tool_calls)) {
+    if (record.role === "assistant") {
       record.reasoning_content ??= "";
     }
   }