feat: integrate Pi backend and Pi Web

pi/packages/coding-agent/examples/extensions/with-deps/.gitignore

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+node_modules/

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

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+/**
+ * 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: {},
+			};
+		},
+	});
+}

pi/packages/coding-agent/examples/extensions/with-deps/package-lock.json

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+{
+  "name": "pi-extension-with-deps",
+  "version": "0.83.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "pi-extension-with-deps",
+      "version": "0.83.0",
+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "devDependencies": {
+        "@types/ms": "^2.1.0"
+      }
+    },
+    "node_modules/@types/ms": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/@types/ms/-/ms-2.1.0.tgz",
+      "integrity": "sha512-GsCCIZDE/p3i96vtEqx+7dBUGXrc7zeSK3wwPHIaRThS+9OhWIXRqzs4d6k1SVU8g91DrNRWxWUGhp5KXQb2VA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/ms": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+      "license": "MIT"
+    }
+  }
+}

pi/packages/coding-agent/examples/extensions/with-deps/package.json

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+{
+  "name": "pi-extension-with-deps",
+  "private": true,
+  "version": "0.83.0",
+  "type": "module",
+  "scripts": {
+    "clean": "echo 'nothing to clean'",
+    "build": "echo 'nothing to build'",
+    "check": "echo 'nothing to check'"
+  },
+  "pi": {
+    "extensions": [
+      "./index.ts"
+    ]
+  },
+  "dependencies": {
+    "ms": "2.1.3"
+  },
+  "devDependencies": {
+    "@types/ms": "2.1.0"
+  }
+}