chore(skills): rename add-*-v2 → add-* and drop dead v1 channel skills

Renamed 13 skill folders to drop the -v2 suffix (the v2/v1 distinction
isn't load-bearing anymore — there is no v1 runtime). Deleted the four
v1 channel skills that occupied the rename target paths (add-discord,
add-slack, add-telegram, add-whatsapp); they targeted src/v1 which is
reference-only per CLAUDE.md.

Skill content still says "v2" in places — that's a follow-up commit.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude/skills/add-resend/SKILL.md

@@ -0,0 +1,93 @@
+---
+name: add-resend-v2
+description: Add Resend (email) channel integration to NanoClaw v2 via Chat SDK.
+---
+
+# Add Resend Email Channel
+
+Connect NanoClaw to email via Resend for async email conversations.
+
+## Install
+
+v2 trunk doesn't ship channels. This skill copies the Resend adapter in from the `channels` branch.
+
+### Pre-flight (idempotent)
+
+Skip to **Credentials** if all of these are already in place:
+
+- `src/channels/resend.ts` exists
+- `src/channels/index.ts` contains `import './resend.js';`
+- `@resend/chat-sdk-adapter` is listed in `package.json` dependencies
+
+Otherwise continue. Every step below is safe to re-run.
+
+### 1. Fetch the channels branch
+
+```bash
+git fetch origin channels
+```
+
+### 2. Copy the adapter
+
+```bash
+git show origin/channels:src/channels/resend.ts > src/channels/resend.ts
+```
+
+### 3. Append the self-registration import
+
+Append to `src/channels/index.ts` (skip if the line is already present):
+
+```typescript
+import './resend.js';
+```
+
+### 4. Install the adapter package (pinned)
+
+```bash
+pnpm install @resend/chat-sdk-adapter@0.1.1
+```
+
+### 5. Build
+
+```bash
+pnpm run build
+```
+
+## Credentials
+
+1. Go to [resend.com](https://resend.com) and create an account.
+2. Add and verify your sending domain.
+3. Go to **API Keys** and create a new key.
+4. Set up a webhook:
+   - Go to **Webhooks** > **Add webhook**.
+   - URL: `https://your-domain/webhook/resend`.
+   - Events: select **email.received**.
+   - Copy the signing secret.
+
+### Configure environment
+
+Add to `.env`:
+
+```bash
+RESEND_API_KEY=re_...
+RESEND_FROM_ADDRESS=bot@yourdomain.com
+RESEND_FROM_NAME=NanoClaw
+RESEND_WEBHOOK_SECRET=your-webhook-secret
+```
+
+Sync to container: `mkdir -p data/env && cp .env data/env/env`
+
+## Next Steps
+
+If you're in the middle of `/setup`, return to the setup flow now.
+
+Otherwise, run `/manage-channels` to wire this channel to an agent group.
+
+## Channel Info
+
+- **type**: `resend`
+- **terminology**: Resend handles email. Each email thread (identified by subject/In-Reply-To headers) is a separate conversation. The "from address" is the bot's identity.
+- **how-to-find-id**: The platform ID is the from email address (e.g. `bot@yourdomain.com`). Each sender's email thread becomes its own conversation.
+- **supports-threads**: yes (via email threading headers -- replies to the same thread stay together)
+- **typical-use**: Async communication -- email conversations with longer response expectations
+- **default-isolation**: Same agent group if you want your agent to handle email alongside other channels. Separate agent group if email contains sensitive correspondence that shouldn't be accessible from other channels.