feat: Add promptCacheKey for Venice provider (#9915)

packages/opencode/src/provider/transform.ts

@@ -598,6 +598,11 @@ export namespace ProviderTransform {
         result["reasoningSummary"] = "auto"
       }
     }
+
+    if (input.model.providerID === "venice") {
+      result["promptCacheKey"] = input.sessionID
+    }
+
     return result
   }