Function parseDiscoveryAnnounce

parseDiscoveryAnnounce(
    appData: Uint8Array<ArrayBufferLike> | null | undefined,
    announcedIdentity: Identity,
    options?: ParseDiscoveryOptions,
): Promise<DiscoveredInterface | null>
Parses and validates a discovery announce's app_data.

Verifies the LXMF stamp at discovery's cheap work factor, unpacks the msgpack info dict, validates the field types/shapes (mirroring Python's received_announce), and builds the normalized DiscoveredInterface record including a generated config_entry.
Parameters
- appData: Uint8Array<ArrayBufferLike> | null | undefined
  Raw app_data bytes from the transport "announce" event detail.
- announcedIdentity: Identity
  Identity reconstructed from the announce.
- Optionaloptions: ParseDiscoveryOptions = {}
Returns Promise<DiscoveredInterface | null>
null for any malformed, unauthorized, or insufficiently-stamped announce (Python logs and swallows).
- Defined in packages/core/src/transport/discovery.js:465