Add WhatsApp Cloud API Channel

Connect NanoClaw to WhatsApp via the official Meta WhatsApp Business Cloud API. NanoClaw doesn't ship channels in trunk, this skill copies the WhatsApp Cloud 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

Fetch the channels branch and copy the WhatsApp Cloud adapter into src/channels/ (overwrite, the branch is canonical):

src/channels/whatsapp-cloud.ts
src/channels/whatsapp-cloud-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 './whatsapp-cloud.js';

3. Install the adapter package

Pinned to an exact version, the supply-chain policy rejects ranges and latest:

@chat-adapter/whatsapp@4.41.1

4. Build and validate

Build guards the typed createChatSdkBridge(...) core call and proves the dependency is installed, the import throws at evaluation if @chat-adapter/whatsapp is missing or the barrel drifts:

pnpm run build

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

whatsapp-cloud-registration.test.ts imports the real channel barrel and asserts the registry contains whatsapp-cloud, it goes red if the import line is deleted or drifts, if the barrel fails to evaluate, or if @chat-adapter/whatsapp isn't installed (the import throws), so it also covers the dependency from step 3.