Function createWelcomeRumor

createWelcomeRumor(
    __namedParameters: {
        author: string;
        groupRelays: string[];
        keyPackageEventId: string;
        welcome: Welcome;
    },
): Rumor
Creates a welcome rumor (kind 444) for a welcome message.
Parameters
- __namedParameters: {
      author: string;
      groupRelays: string[];
      keyPackageEventId: string;
      welcome: Welcome;
  }
  - author: string
    The author's public key (hex string)
  - groupRelays: string[]
    Array of relay URLs for the group (becomes the non-empty relays tag)
  - keyPackageEventId: string
    The ID of the KeyPackage event consumed for this add. Required: the spec mandates a 32-byte-hex e tag on every welcome rumor (transports/nostr.md "Welcome delivery").
  - welcome: Welcome
    The MLS welcome message
Returns Rumor
Welcome rumor with precomputed ID
- Defined in ../home/runner/work/marmot-ts/marmot-ts/src/core/welcome-event.ts:28