fix(venice): avoid usage streaming chunks for Venice models (openclaw#15878) thanks @Shuai-DaiDai

Venice.ai API returns SSE chunks containing only usage metadata without
a choices array. The SDK crashes trying to access choices[0] on these
chunks with: Cannot read properties of undefined (reading '0')

Changes:
- Disable streaming by default for all Venice models
- Apply to both static catalog and dynamically discovered models
- Users can explicitly enable streaming in config if needed

This is a workaround until the SDK handles Venice's streaming format.

Fixes #15819

src/agents/venice-models.ts

@@ -300,6 +300,11 @@ export function buildVeniceModelDefinition(entry: VeniceCatalogEntry): ModelDefi
     cost: VENICE_DEFAULT_COST,
     contextWindow: entry.contextWindow,
     maxTokens: entry.maxTokens,
+    // Avoid usage-only streaming chunks that can break OpenAI-compatible parsers.
+    // See: https://github.com/openclaw/openclaw/issues/15819
+    compat: {
+      supportsUsageInStreaming: false,
+    },
   };
 }
 
@@ -381,6 +386,10 @@ export async function discoverVeniceModels(): Promise<ModelDefinitionConfig[]> {
           cost: VENICE_DEFAULT_COST,
           contextWindow: apiModel.model_spec.availableContextTokens || 128000,
           maxTokens: 8192,
+          // Avoid usage-only streaming chunks that can break OpenAI-compatible parsers.
+          compat: {
+            supportsUsageInStreaming: false,
+          },
         });
       }
     }