Webhook headers renamed to X-Webwhen-*
Webhook delivery headers were renamed as part of the rebrand from Torale to webwhen. The four custom headers (Event, Signature, Delivery, Timestamp) now use the X-Webwhen-* prefix instead of X-Torale-*, and the User-Agent string is now Webwhen-Webhooks/1.0. If you have any webhook receivers that parse these headers — particularly any signature-verification code matching on X-Torale-Signature — update them to the new names.