fix: invoice contract test

apps/leaf/tests/evals/harness/configs/genericMcpAgentConfig.ts

@@ -1,3 +1,5 @@
+import { leafChatAgentDefaults } from "../../../../src/lib/chatAgentConfig.js";
+
 export type GenericMcpAgentDriverConfig = {
 	maxSteps?: number;
 	model?: string;
@@ -7,6 +9,6 @@ export const genericMcpAgentInstructions =
 	"Use Autumn MCP tools. Call getAgentRules before customer, billing, balance, entity, or plan work. Preview destructive writes before applying them.";
 
 export const defaultGenericMcpAgentConfig = {
-	maxSteps: 6,
-	model: "anthropic/claude-sonnet-4-6",
+	maxSteps: leafChatAgentDefaults.maxSteps,
+	model: leafChatAgentDefaults.model,
 } satisfies Required<GenericMcpAgentDriverConfig>;