v2: add Chat SDK channel adapters and skills for 11 platforms

Thin wrapper adapters + SKILL.md for Slack, Telegram, GitHub, Linear,
Google Chat, Teams, WhatsApp Cloud API, Resend, Matrix, Webex, iMessage.
All follow the same pattern as discord-v2.ts: readEnvFile → create*Adapter
→ createChatSdkBridge → registerChannelAdapter.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/skills/add-whatsapp-cloud-v2/SKILL.md

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+---
+name: add-whatsapp-cloud-v2
+description: Add WhatsApp Business Cloud API channel to NanoClaw v2 via Chat SDK. Official Meta API (not Baileys).
+---
+
+# Add WhatsApp Cloud API Channel (v2)
+
+This skill adds WhatsApp support via the official Meta WhatsApp Business Cloud API. This is different from the Baileys-based WhatsApp adapter (which uses WhatsApp Web protocol).
+
+## Phase 1: Pre-flight
+
+Check if `src/channels/whatsapp-cloud-v2.ts` exists and the import is uncommented in `src/channels/index.ts`. If both are in place, skip to Phase 3.
+
+## Phase 2: Apply Code Changes
+
+### Install the adapter package
+
+```bash
+npm install @chat-adapter/whatsapp
+```
+
+### Enable the channel
+
+Uncomment the WhatsApp Cloud API import in `src/channels/index.ts`:
+
+```typescript
+import './whatsapp-cloud-v2.js';
+```
+
+### Build
+
+```bash
+npm run build
+```
+
+## Phase 3: Setup
+
+### Create WhatsApp Business App
+
+> 1. Go to [Meta for Developers](https://developers.facebook.com/apps/) and create an app (type: Business)
+> 2. Add the **WhatsApp** product
+> 3. Go to **WhatsApp** > **API Setup**:
+>    - Note the **Phone Number ID** (not the phone number itself)
+>    - Generate a **permanent System User access token** with `whatsapp_business_messaging` permission
+> 4. Go to **WhatsApp** > **Configuration**:
+>    - Set webhook URL: `https://your-domain/webhook/whatsapp`
+>    - Set a **Verify Token** (any random string you choose)
+>    - Subscribe to webhook fields: `messages`
+> 5. Copy the **App Secret** from **Settings** > **Basic**
+
+### Configure environment
+
+Add to `.env`:
+
+```bash
+WHATSAPP_ACCESS_TOKEN=your-system-user-access-token
+WHATSAPP_PHONE_NUMBER_ID=your-phone-number-id
+WHATSAPP_APP_SECRET=your-app-secret
+WHATSAPP_VERIFY_TOKEN=your-verify-token
+```
+
+Sync to container: `mkdir -p data/env && cp .env data/env/env`
+
+### Build and restart
+
+```bash
+npm run build
+launchctl kickstart -k gui/$(id -u)/com.nanoclaw  # macOS
+# systemctl --user restart nanoclaw  # Linux
+```
+
+## Phase 4: Verify
+
+> Send a message to your WhatsApp Business number. The bot should respond within a few seconds.
+> Note: WhatsApp Cloud API only supports 1:1 DMs, not group chats.
+
+## Removal
+
+1. Comment out `import './whatsapp-cloud-v2.js'` in `src/channels/index.ts`
+2. Remove `WHATSAPP_ACCESS_TOKEN`, `WHATSAPP_PHONE_NUMBER_ID`, `WHATSAPP_APP_SECRET`, `WHATSAPP_VERIFY_TOKEN` from `.env`
+3. `npm uninstall @chat-adapter/whatsapp`
+4. Rebuild and restart