Add Slack Channel

Adds Slack support via the Chat SDK bridge.

Install

NanoClaw doesn't ship channels in trunk. This skill copies the Slack adapter in from the channels branch.

Pre-flight (idempotent)

Skip to Credentials if all of these are already in place:

• src/channels/slack.ts exists
• src/channels/index.ts contains import './slack.js';
• @chat-adapter/slack is listed in package.json dependencies

Otherwise continue. Every step below is safe to re-run.

1. Fetch the channels branch