Update an existing goal details. Supports partial updates where only the fields that are provided in the request body will be updated.

Cycle Management: You can assign a goal to a cycle, move it between cycles, or unassign it from a cycle using the cycleId field:

• To assign to a cycle: provide a valid cycle ID
• To move between cycles: provide a different cycle ID
• To unassign from a cycle: provide null as the value
• To keep the current cycle: omit the field entirely

Note: Goal status updates are not supported via this endpoint. Use the Update Goal Status endpoint instead.