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-github-v2/SKILL.md

@@ -0,0 +1,80 @@
+---
+name: add-github-v2
+description: Add GitHub channel integration to NanoClaw v2 via Chat SDK. PR comment threads as conversations.
+---
+
+# Add GitHub Channel (v2)
+
+This skill adds GitHub support to NanoClaw v2 using the Chat SDK bridge. The agent can participate in PR comment threads.
+
+## Phase 1: Pre-flight
+
+Check if `src/channels/github-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/github
+```
+
+### Enable the channel
+
+Uncomment the GitHub import in `src/channels/index.ts`:
+
+```typescript
+import './github-v2.js';
+```
+
+### Build
+
+```bash
+npm run build
+```
+
+## Phase 3: Setup
+
+### Create GitHub credentials
+
+> 1. Go to [GitHub Settings > Developer Settings > Personal Access Tokens](https://github.com/settings/tokens)
+> 2. Create a **Fine-grained token** with:
+>    - Repository access: select the repos you want the bot to monitor
+>    - Permissions: **Pull requests** (Read & Write), **Issues** (Read & Write)
+> 3. Copy the token
+> 4. Set up a webhook on your repo(s):
+>    - Go to **Settings** > **Webhooks** > **Add webhook**
+>    - Payload URL: `https://your-domain/webhook/github`
+>    - Content type: `application/json`
+>    - Secret: generate a random string
+>    - Events: select **Issue comments**, **Pull request review comments**
+
+### Configure environment
+
+Add to `.env`:
+
+```bash
+GITHUB_TOKEN=github_pat_...
+GITHUB_WEBHOOK_SECRET=your-webhook-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
+
+> @mention the bot in a PR comment or issue comment. The bot should respond within a few seconds.
+
+## Removal
+
+1. Comment out `import './github-v2.js'` in `src/channels/index.ts`
+2. Remove `GITHUB_TOKEN` and `GITHUB_WEBHOOK_SECRET` from `.env`
+3. `npm uninstall @chat-adapter/github`
+4. Rebuild and restart