Core memory candidates

Core memory candidate routes review salient flashbulb-like records before they are promoted into durable core memory.

Routes

Scope	Method	Path
User	PUT	/api/user/memory/candidates/:weaviateId
Assistant	PUT	/api/assistants/:id/memory/candidates/:weaviateId
Organization	PUT	/api/organizations/:id/memory/candidates/:weaviateId

Request body

{
  "action": "approve",
  "collection": "UserPreferences"
}

action must be approve or reject. collection is required because candidates can come from different memory collections.

Approving a candidate promotes it into core memory. Rejecting a candidate removes it from the candidate queue.