Read-only PKDNS actor (no keypair; resolve only).
Resolve the homeserver for this user (requires keypair).
Homeserver public key or undefined if not found.
Force publish homeserver immediately (even if fresh).
Requires keypair or to be signer bound.
Optionalhost_override: PublicKey | nullRepublish homeserver if record is missing/stale.
Requires keypair or to be signer bound.
Optionalhost_override: PublicKey | nullStaticfrom
Resolve/publish
_pubkyPKDNS records (homeserver pointers).