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-slack-v2/SKILL.md

@@ -0,0 +1,81 @@
+---
+name: add-slack-v2
+description: Add Slack channel integration to NanoClaw v2 via Chat SDK.
+---
+
+# Add Slack Channel (v2)
+
+This skill adds Slack support to NanoClaw v2 using the Chat SDK bridge.
+
+## Phase 1: Pre-flight
+
+Check if `src/channels/slack-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/slack
+```
+
+### Enable the channel
+
+Uncomment the Slack import in `src/channels/index.ts`:
+
+```typescript
+import './slack-v2.js';
+```
+
+### Build
+
+```bash
+npm run build
+```
+
+## Phase 3: Setup
+
+### Create Slack App (if needed)
+
+If the user doesn't have a Slack app:
+
+> 1. Go to [api.slack.com/apps](https://api.slack.com/apps) and click **Create New App** > **From scratch**
+> 2. Name it (e.g., "NanoClaw") and select your workspace
+> 3. Go to **OAuth & Permissions** and add Bot Token Scopes:
+>    - `chat:write`, `channels:history`, `groups:history`, `im:history`, `channels:read`, `groups:read`, `users:read`, `reactions:write`
+> 4. Click **Install to Workspace** and copy the **Bot User OAuth Token** (`xoxb-...`)
+> 5. Go to **Basic Information** and copy the **Signing Secret**
+> 6. Go to **Event Subscriptions**, enable events, and subscribe to:
+>    - `message.channels`, `message.groups`, `message.im`, `app_mention`
+> 7. Set the Request URL to your webhook endpoint (e.g., `https://your-domain/webhook/slack`)
+
+### Configure environment
+
+Add to `.env`:
+
+```bash
+SLACK_BOT_TOKEN=xoxb-your-bot-token
+SLACK_SIGNING_SECRET=your-signing-secret
+```
+
+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
+
+> Add the bot to a Slack channel, then send a message or @mention the bot.
+> The bot should respond within a few seconds.
+
+## Removal
+
+1. Comment out `import './slack-v2.js'` in `src/channels/index.ts`
+2. Remove `SLACK_BOT_TOKEN` and `SLACK_SIGNING_SECRET` from `.env`
+3. `npm uninstall @chat-adapter/slack`
+4. Rebuild and restart