fix(cli): surface agent_custom_instructions on add in both CLIs (#6910)

cli/node/src/backend/base.ts

@@ -15,6 +15,7 @@ export interface AddOptions {
 	infer?: boolean;
 	expires?: string;
 	customInstructions?: string;
+	agentCustomInstructions?: string;
 	customCategories?: Record<string, string>[];
 	structuredDataSchema?: Record<string, unknown>;
 	timestamp?: number;