fix agent template init workspace writes

agent_builder/tools.py

@@ -259,13 +259,9 @@ def build_tools(ctx: ToolContext) -> list[Any]:
         written: list[dict[str, Any]] = []
         for path, content in files.items():
             key = prefix + path
-            s3.put_object(
-                Bucket=bucket,
-                Key=key,
-                Body=content.encode("utf-8"),
-                ContentType="text/plain; charset=utf-8",
-            )
-            written.append({"path": key, "size": len(content)})
+            encoded = content.encode("utf-8")
+            store.put(key, encoded, "text/plain; charset=utf-8")
+            written.append({"path": key, "size": len(encoded)})
         return json.dumps({
             "ok": True,
             "agent": name,