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-telegram-v2/SKILL.md

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+---
+name: add-telegram-v2
+description: Add Telegram channel integration to NanoClaw v2 via Chat SDK.
+---
+
+# Add Telegram Channel (v2)
+
+This skill adds Telegram support to NanoClaw v2 using the Chat SDK bridge.
+
+## Phase 1: Pre-flight
+
+Check if `src/channels/telegram-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/telegram
+```
+
+### Enable the channel
+
+Uncomment the Telegram import in `src/channels/index.ts`:
+
+```typescript
+import './telegram-v2.js';
+```
+
+### Build
+
+```bash
+npm run build
+```
+
+## Phase 3: Setup
+
+### Create Telegram Bot (if needed)
+
+> 1. Open Telegram and search for `@BotFather`
+> 2. Send `/newbot` and follow the prompts:
+>    - Bot name: Something friendly (e.g., "NanoClaw Assistant")
+>    - Bot username: Must end with "bot" (e.g., "nanoclaw_bot")
+> 3. Copy the bot token (looks like `123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11`)
+
+### Disable Group Privacy (for group chats)
+
+> **Important for group chats**: By default, Telegram bots only see @mentions and commands in groups. To let the bot see all messages:
+>
+> 1. Open `@BotFather` > `/mybots` > select your bot
+> 2. **Bot Settings** > **Group Privacy** > **Turn off**
+
+### Configure environment
+
+Add to `.env`:
+
+```bash
+TELEGRAM_BOT_TOKEN=your-bot-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 bot in Telegram (search for its username).
+> For groups: add the bot to a group and send a message.
+> The bot should respond within a few seconds.
+
+## Removal
+
+1. Comment out `import './telegram-v2.js'` in `src/channels/index.ts`
+2. Remove `TELEGRAM_BOT_TOKEN` from `.env`
+3. `npm uninstall @chat-adapter/telegram`
+4. Rebuild and restart