move Nip05 type to nip05.ts

core.ts

@@ -23,8 +23,6 @@ export type NostrEvent = Event
 export type EventTemplate = Pick<Event, 'kind' | 'tags' | 'content' | 'created_at'>
 export type UnsignedEvent = Pick<Event, 'kind' | 'tags' | 'content' | 'created_at' | 'pubkey'>
 
-export type Nip05 = `${string}@${string}`
-
 /** An event whose signature has been verified. */
 export interface VerifiedEvent extends Event {
   [verifiedSymbol]: true

nip05.ts

@@ -1,6 +1,7 @@
-import { Nip05 } from './core.ts'
 import { ProfilePointer } from './nip19.ts'
 
+export type Nip05 = `${string}@${string}`
+
 /**
  * NIP-05 regex. The localpart is optional, and should be assumed to be `_` otherwise.
  *