- nip19.dart: bech32 encodeNpub/encodeNsec for raw keys (no TLV entities),
verified against the canonical NIP-19 test vectors.
- nip05.dart: verifyNip05 with an injectable http.Client plus a pure
nip05MatchesPubkey helper for the .well-known/nostr.json check.
- fetchProfileFor(fetcher, pubkey): fetches and parses any user's kind-0 into
a typed NostrProfile (newest-wins), generalizing the own-key FetchProfile.
- Export all three from swarm.dart; unit tests for each (bech32 vectors,
MockClient HTTP cases, fake-relay profile parsing).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
