Convert custom tool examples to subdirectory/index.ts structure

- hello.ts → hello/index.ts
- question.ts → question/index.ts
- todo.ts → todo/index.ts
- subagent/subagent.ts → subagent/index.ts

packages/coding-agent/examples/custom-tools/hello/index.ts

@@ -0,0 +1,20 @@
+import { Type } from "@sinclair/typebox";
+import type { CustomToolFactory } from "@mariozechner/pi-coding-agent";
+
+const factory: CustomToolFactory = (pi) => ({
+  name: "hello",
+  label: "Hello",
+  description: "A simple greeting tool",
+  parameters: Type.Object({
+    name: Type.String({ description: "Name to greet" }),
+  }),
+
+  async execute(toolCallId, params) {
+    return {
+      content: [{ type: "text", text: `Hello, ${params.name}!` }],
+      details: { greeted: params.name },
+    };
+  },
+});
+
+export default factory;