feat: add Chatwork adapter for chat SDK

.changeset/chatwork-adapter.md

@@ -0,0 +1,11 @@
+---
+"@chat-adapter/chatwork": minor
+---
+
+Add Chatwork adapter for chat SDK
+
+Implements a new adapter for Chatwork with support for:
+- Webhook handling with HMAC-SHA256 signature verification
+- Sending, editing, and deleting messages via Chatwork REST API v2
+- Chatwork-specific format conversion (info/code/hr/To tags to mdast AST)
+- Zero-config factory function with environment variable support

packages/adapter-chatwork/package.json

@@ -0,0 +1,55 @@
+{
+  "name": "@chat-adapter/chatwork",
+  "version": "4.14.0",
+  "description": "Chatwork adapter for chat",
+  "type": "module",
+  "main": "./dist/index.js",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    }
+  },
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "build": "tsup",
+    "dev": "tsup --watch",
+    "test": "vitest run --coverage",
+    "test:watch": "vitest",
+    "typecheck": "tsc --noEmit",
+    "clean": "rm -rf dist"
+  },
+  "dependencies": {
+    "@chat-adapter/shared": "workspace:*",
+    "chat": "workspace:*"
+  },
+  "devDependencies": {
+    "@types/node": "^22.10.2",
+    "tsup": "^8.3.5",
+    "typescript": "^5.7.2",
+    "vitest": "^2.1.8"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/vercel/chat.git",
+    "directory": "packages/adapter-chatwork"
+  },
+  "homepage": "https://github.com/vercel/chat#readme",
+  "bugs": {
+    "url": "https://github.com/vercel/chat/issues"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "keywords": [
+    "chat",
+    "chatwork",
+    "bot",
+    "adapter"
+  ],
+  "license": "MIT"
+}