feat: integrate Pi backend and Pi Web

pi/packages/coding-agent/examples/extensions/with-deps/index.ts

@@ -0,0 +1,32 @@
+/**
+ * Example extension with its own npm dependencies.
+ * Tests that jiti resolves modules from the extension's own node_modules.
+ *
+ * Requires: npm install in this directory
+ */
+
+import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
+import ms from "ms";
+import { Type } from "typebox";
+
+export default function (pi: ExtensionAPI) {
+	// Register a tool that uses ms
+	pi.registerTool({
+		name: "parse_duration",
+		label: "Parse Duration",
+		description: "Parse a human-readable duration string (e.g., '2 days', '1h', '5m') to milliseconds",
+		parameters: Type.Object({
+			duration: Type.String({ description: "Duration string like '2 days', '1h', '5m'" }),
+		}),
+		execute: async (_toolCallId, params) => {
+			const result = ms(params.duration as ms.StringValue);
+			if (result === undefined) {
+				throw new Error(`Invalid duration: "${params.duration}"`);
+			}
+			return {
+				content: [{ type: "text", text: `${params.duration} = ${result} milliseconds` }],
+				details: {},
+			};
+		},
+	});
+}