fix(routing): harden originating reply routing

src/agents/pi-tool-definition-adapter.test.ts

@@ -1,6 +1,5 @@
-import { describe, expect, it } from "vitest";
-
 import type { AgentTool } from "@mariozechner/pi-agent-core";
+import { describe, expect, it } from "vitest";
 
 import { toToolDefinitions } from "./pi-tool-definition-adapter.js";
 

src/agents/pi-tool-definition-adapter.ts

@@ -38,7 +38,7 @@ export function toToolDefinitions(tools: AnyAgentTool[]): ToolDefinition[] {
               : "";
           if (name === "AbortError") throw err;
           const message =
-            err instanceof Error ? err.stack ?? err.message : String(err);
+            err instanceof Error ? (err.stack ?? err.message) : String(err);
           logError(`[tools] ${tool.name} failed: ${message}`);
           return jsonResult({
             status: "error",