v2: channel isolation model, manage-channels skill, refactored channel skills

- Add three-level isolation model (shared session, same agent, separate agent)
  with agent-shared session mode for cross-channel shared sessions
- Create /manage-channels skill for wiring channels to agent groups
- Refactor all 12 v2 channel skills: lean SKILL.md + VERIFY.md + REMOVE.md
  with structured Channel Info section for platform-specific metadata
- Create /add-discord-v2 skill (was missing)
- Add step 5a to setup SKILL.md invoking /manage-channels after channel install
- Update setup/verify.ts to check all 12 channel token types
- Add docs/v2-isolation-model.md explaining the isolation model
- Update v2-checklist.md and v2-setup-wiring.md to reflect completed work

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/skills/add-discord-v2/SKILL.md

@@ -0,0 +1,69 @@
+---
+name: add-discord-v2
+description: Add Discord bot channel integration to NanoClaw v2 via Chat SDK.
+---
+
+# Add Discord Channel
+
+Adds Discord bot support to NanoClaw v2. Discord is built in — no adapter package to install.
+
+## Pre-flight
+
+Check if `src/channels/discord.ts` exists and the import is uncommented in `src/channels/index.ts`. If both are in place, skip to Credentials.
+
+## Install
+
+Discord support is bundled with NanoClaw — there is no separate package to install.
+
+### Enable the channel
+
+Uncomment the Discord import in `src/channels/index.ts`:
+
+```typescript
+import './discord.js';
+```
+
+### Build
+
+```bash
+npm run build
+```
+
+## Credentials
+
+### Create Discord Bot
+
+1. Go to the [Discord Developer Portal](https://discord.com/developers/applications)
+2. Click **New Application** and give it a name (e.g., "NanoClaw Assistant")
+3. Go to the **Bot** tab and click **Add Bot** if needed
+4. Copy the Bot Token (click **Reset Token** if you need a new one — you can only see it once)
+5. Under **Privileged Gateway Intents**, enable **Message Content Intent**
+6. Go to **OAuth2** > **URL Generator**:
+   - Scopes: select `bot`
+   - Bot Permissions: select `Send Messages`, `Read Message History`, `Add Reactions`, `Attach Files`, `Use Slash Commands`
+7. Copy the generated URL and open it in your browser to invite the bot to your server
+
+### Configure environment
+
+Add to `.env`:
+
+```bash
+DISCORD_BOT_TOKEN=your-bot-token
+```
+
+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**: `discord`
+- **terminology**: Discord has "servers" (also called "guilds") containing "channels." Text channels start with #. The bot can also receive direct messages.
+- **how-to-find-id**: Enable Developer Mode in Discord (Settings > App Settings > Advanced > Developer Mode). Then right-click a server or channel and select "Copy ID."
+- **supports-threads**: yes
+- **typical-use**: Interactive chat — server channels or direct messages
+- **default-isolation**: Same agent group for your personal server. Separate agent group for servers with different communities or where different members have different information boundaries.