Create wiki page
POST/projects/:id/wiki-pages
Creates a wiki page in the project. Supply externalRef for idempotent upserts — a second call with the same ref returns the existing page with 200.
Permission: write:wiki. The key must be bound to a user.
Add-on: requires the Illumera add-on. Without it the call returns 403 with reason: addon_required.
Request
A page with the same externalRef already existed.