Updates specific fields of a governance. Only the fields provided in the request body will be updated.
All other fields will remain unchanged.

Request property names use snake_case in JSON. When status is included, it is applied after the other fields in the same request.

Allowed values for patchable fields:

• title: title
• description: body / HTML
• code: business code (e.g. GOV-12)
• status: Draft, In Progress, In Review, Ready For Approval, Approved
• data_classification: data classification label configured for the tenant
• review_date: ISO-8601 instant string (e.g. 2025-09-15T17:00:00Z)
• owner: user email or display name
• approver: user email or display name
• team: team name
• tags: array of tag names; replaces the governance's current tags
• contributors: array of contributor email addresses; replaces the current contributor list