Updates a project's title or description, including archived projects.
Requires at least one editable field. Omitted fields remain unchanged; null or empty descriptions clear the existing content.
The effective actor must have permission to edit the project, including for authorized on-behalf-of requests.
Author, confidentiality, archive state, candidate memberships, and custom fields are preserved. Missing historical required custom fields do not block edits.

Requires the projectsWrite permission.