Updates specific fields of an objective. 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.

Common Use Cases:

• Updating status (Supported values: Not Assessed, Not Compliant, Partially Compliant, In Review, Compliant, Not Applicable)
• Updating target_maturity (Supported values: Not Implemented, Initial, Defined, Reviewed, Optimizing)
• Updating current_maturity (Supported values for name: Not Implemented, Initial, Defined, Reviewed, Optimizing; observation is required with name)
• Updating implementation_details, description, or remarks
• Updating in_scope (true or false)

When both in_scope and status are supplied, status is applied last and may adjust
the final scope according to the existing objective status rules.