Add a WhatsApp adapter backed by Baileys linked-device auth, plus desktop QR binding UI, server config endpoints, sidecar startup wiring, tests, and documentation.
Constraint: Uses WhatsApp Web linked-device auth, not Meta WhatsApp Business Cloud API.
Tested:
- cd adapters && bun run check:adapters
- bun test src/server/__tests__/adapters.test.ts
- cd desktop && bun run check:desktop
- bun run check:native
- bun run check:persistence-upgrade
- bun run check:docs
Not-tested:
- Live WhatsApp QR pairing, because no WhatsApp account/device was exercised here.
- bun run check:server, because the existing src/server/__tests__/conversations.test.ts timeout still fails independently.
Confidence: medium
Scope-risk: moderate