Asynchronous strategies (e.g. WEBHOOK) must call back to the bot
on this URL when the preview environment is ready. The {runId} and
{secret} placeholders are filled in per request and embedded in the
outbound webhook payload as callbackUrl.
ai-git-bot.public-base-url property (e.g.
https://bot.acme.io) so the bot can hand out a fully-qualified URL.