fix(mux): field-level merge on network policy egress updates (#10338)

Author: stainless-app[bot]

.stats.yml

@@ -1,4 +1,4 @@
 configured_endpoints: 119
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/runloop-ai/runloop-0b7cd0c2fc193b18189cd7f44cf45ece7726b5d485fb72577f7d235266432ea0.yml
-openapi_spec_hash: 78c340dbfb9d3d58b24ef318fc2a657b
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/runloop-ai/runloop-d0efdaa19d8a5685def3947450df7f9bdaf9bad3243317d514add5d22129fc5f.yml
+openapi_spec_hash: 7e484ea9f60294503bf4691fe3efef3a
 config_hash: 218b8d25038e627faab98532392ee9a0

src/runloop_api_client/resources/network_policies.py

@@ -191,7 +191,8 @@ def update(
     ) -> NetworkPolicyView:
         """Update an existing NetworkPolicy.
 
-        All fields are optional.
+        All fields are optional - null fields preserve
+        existing values, provided fields replace entirely.
 
         Args:
           allow_agent_gateway: If true, allows devbox egress to the agent gateway.
@@ -525,7 +526,8 @@ async def update(
     ) -> NetworkPolicyView:
         """Update an existing NetworkPolicy.
 
-        All fields are optional.
+        All fields are optional - null fields preserve
+        existing values, provided fields replace entirely.
 
         Args:
           allow_agent_gateway: If true, allows devbox egress to the agent gateway.