**Problem:**
The BlueBubbles iMessage gateway was not receiving incoming messages even though:
1. BlueBubbles Server was properly configured and running
2. Hermes gateway started without errors
3. Webhook listener was started on the configured port
The root cause was that the BlueBubbles adapter only started a local webhook
listener but never registered the webhook URL with the BlueBubbles server via
the API. Without registration, the server doesn't know where to send events.
**Fix:**
1. Added _register_webhook() method that POSTs to /api/v1/webhook with the
listener URL and event types (new-message, updated-message, message)
2. Added _unregister_webhook() method for clean shutdown
3. Both methods handle the case where webhook listens on 0.0.0.0/127.0.0.1
by using 'localhost' as the external hostname
4. Fixed documentation: 'hermes gateway logs' → 'hermes logs gateway'
**API Reference:**
https://docs.bluebubbles.app/server/developer-guides/rest-api-and-webhooks
**Testing:**
- Webhook registration is now automatic when gateway starts
- Failed registration logs a warning but doesn't prevent startup
- Clean shutdown unregisters the webhook
Closes: iMessage gateway not working issue
The docs incorrectly referenced 'hermes pairing generate bluebubbles'
which doesn't exist. The existing reactive pairing flow already handles
this — when an unknown user messages the bot, it sends them a code
automatically, and the owner approves with 'hermes pairing approve'.
