initial: webhook telegram adapter for pi with streaming replies

- webhook server with secret validation, rate limiting, body guards
- streaming replies via sendMessage + editMessageText throttled loop
- RPC session management for persistent conversations
- 15/15 tests passing

package.json

@@ -0,0 +1,38 @@
+{
+  "name": "pi-telegram-webhook",
+  "version": "0.1.0",
+  "description": "Webhook-based Telegram adapter for pi with streaming replies and RPC sessions",
+  "type": "module",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "pi": {
+    "extensions": ["./src/index.ts"]
+  },
+  "files": [
+    "dist",
+    "README.md"
+  ],
+  "scripts": {
+    "build": "tsc",
+    "test": "vitest run",
+    "dev": "tsc --watch",
+    "prepublishOnly": "npm run build"
+  },
+  "keywords": [
+    "pi",
+    "telegram",
+    "webhook",
+    "extension"
+  ],
+  "author": "",
+  "license": "MIT",
+  "peerDependencies": {
+    "@mariozechner/pi-coding-agent": ">=0.60.0"
+  },
+  "devDependencies": {
+    "@types/node": "^20.0.0",
+    "typescript": "^5.0.0",
+    "vitest": "^2.0.0",
+    "@mariozechner/pi-coding-agent": "^0.64.0"
+  }
+}