Add Webex Channel

Adds Cisco Webex support via the Chat SDK bridge. NanoClaw doesn't ship channels in trunk, this skill copies the Webex adapter in from the channels branch.

The mechanical steps under Apply carry nc: directive fences: an agent reads the prose and applies them, and a parser can apply them deterministically from the same document. Every directive is idempotent, so the whole skill is safe to re-run; anything a parser can't apply falls back to the prose beside it.

Apply

1. Copy the adapter and its registration test

Fetch the channels branch and copy the Webex adapter and its registration test into src/channels/ (overwrite, the branch is canonical):

src/channels/webex.ts
src/channels/webex-registration.test.ts

2. Register the adapter

Append the self-registration import to the channel barrel (skipped if the line is already present). This one line is the skill's only reach-in into core:

import './webex.js';

3. Install the adapter package

Pinned to an exact version, the supply-chain policy rejects ranges and latest. The Webex adapter ships under the third-party @bitbasti/* namespace, not @chat-adapter/*, so it carries its own version line (0.1.0) rather than tracking the chat core version:

@bitbasti/chat-adapter-webex@0.1.0

4. Build and validate

Build first: it guards the typed createChatSdkBridge(...) core call and proves the dependency is installed. Then run the one integration test.

pnpm run build

pnpm exec vitest run src/channels/webex-registration.test.ts