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-matrix-v2/SKILL.md

@@ -0,0 +1,77 @@
+---
+name: add-matrix-v2
+description: Add Matrix channel integration to NanoClaw v2 via Chat SDK. Works with any Matrix homeserver (Element, Beeper, etc.).
+---
+
+# Add Matrix Channel (v2)
+
+This skill adds Matrix support to NanoClaw v2 using the Chat SDK bridge. Works with any Matrix homeserver.
+
+## Phase 1: Pre-flight
+
+Check if `src/channels/matrix-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 @beeper/chat-adapter-matrix
+```
+
+### Enable the channel
+
+Uncomment the Matrix import in `src/channels/index.ts`:
+
+```typescript
+import './matrix-v2.js';
+```
+
+### Build
+
+```bash
+npm run build
+```
+
+## Phase 3: Setup
+
+### Create Matrix bot account
+
+> 1. Register a bot account on your Matrix homeserver (e.g., via Element)
+> 2. Get the homeserver URL (e.g., `https://matrix.org` or your self-hosted URL)
+> 3. Get an access token:
+>    - In Element: **Settings** > **Help & About** > **Access Token** (advanced)
+>    - Or via API: `curl -XPOST 'https://matrix.org/_matrix/client/r0/login' -d '{"type":"m.login.password","user":"botuser","password":"..."}'`
+> 4. Note the bot's user ID (e.g., `@botuser:matrix.org`)
+
+### Configure environment
+
+Add to `.env`:
+
+```bash
+MATRIX_BASE_URL=https://matrix.org
+MATRIX_ACCESS_TOKEN=your-access-token
+MATRIX_USER_ID=@botuser:matrix.org
+MATRIX_BOT_USERNAME=botuser
+```
+
+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
+
+> Invite the bot to a Matrix room and send a message. The bot should respond within a few seconds.
+
+## Removal
+
+1. Comment out `import './matrix-v2.js'` in `src/channels/index.ts`
+2. Remove `MATRIX_BASE_URL`, `MATRIX_ACCESS_TOKEN`, `MATRIX_USER_ID`, `MATRIX_BOT_USERNAME` from `.env`
+3. `npm uninstall @beeper/chat-adapter-matrix`
+4. Rebuild and restart