test(pi-tools): use typebox schema fixture

src/agents/pi-tools.schema.test.ts

@@ -1,4 +1,5 @@
 import type { AgentTool } from "@mariozechner/pi-agent-core";
+import { Type } from "@sinclair/typebox";
 import { describe, expect, it, vi } from "vitest";
 import { normalizeToolParameters } from "./pi-tools.schema.js";
 
@@ -8,21 +9,10 @@ describe("normalizeToolParameters", () => {
       name: "demo",
       label: "demo",
       description: "demo",
-      parameters: {
-        type: "object",
-        properties: {
-          count: {
-            type: "integer",
-            minimum: 1,
-            maximum: 5,
-          },
-          query: {
-            type: "string",
-            minLength: 2,
-          },
-        },
-        required: ["count"],
-      },
+      parameters: Type.Object({
+        count: Type.Integer({ minimum: 1, maximum: 5 }),
+        query: Type.Optional(Type.String({ minLength: 2 })),
+      }),
       execute: vi.fn(),
     };