stage-13: WhatsApp bridge with Baileys + Python adapter

Node.js bridge (bridge/whatsapp/): Baileys client with Express HTTP API
on localhost:8098 — QR code linking, message queue, reconnection logic.

Python adapter (src/adapters/whatsapp.py): polls bridge every 2s, routes
through router.py, separate whatsapp.owner/admins auth, security logging.

Integrated in main.py alongside Discord + Telegram via asyncio.gather.
CLI: echo whatsapp status/qr. 442 tests pass (32 new, zero failures).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bridge/whatsapp/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "echo-whatsapp-bridge",
+  "version": "1.0.0",
+  "description": "WhatsApp bridge for Echo Core using Baileys",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js"
+  },
+  "dependencies": {
+    "@whiskeysockets/baileys": "^6.7.16",
+    "express": "^4.21.0",
+    "pino": "^9.6.0",
+    "qrcode": "^1.5.4"
+  }
+}