refactor: dedupe agent and reply runtimes

src/agents/pi-embedded-runner.splitsdktools.test.ts

@@ -1,17 +1,6 @@
-import type { AgentTool, AgentToolResult } from "@mariozechner/pi-agent-core";
-import { Type } from "@sinclair/typebox";
 import { describe, expect, it } from "vitest";
 import { splitSdkTools } from "./pi-embedded-runner.js";
-
-function createStubTool(name: string): AgentTool {
-  return {
-    name,
-    label: name,
-    description: "",
-    parameters: Type.Object({}),
-    execute: async () => ({}) as AgentToolResult<unknown>,
-  };
-}
+import { createStubTool } from "./test-helpers/pi-tool-stubs.js";
 
 describe("splitSdkTools", () => {
   const tools = [