Added complete test coverage for WebFinger JRD generation:
## Static Resources Tests (11 tests)
- Unknown resource returns null
- Basic JRD generation
- Subject defaults to resource when not provided
- Aliases support
- Properties support (URI-based names)
- Links support with rel, href, type
- Rel filtering (single and multiple)
- Link titles with language tags
- Complete JRD with all fields
## Protocol Support Tests
- HTTP/HTTPS resource URIs
- ActivityPub profile discovery (self rel, application/activity+json)
- OpenID Connect issuer discovery
## Edge Cases (4 tests)
- Resource with no links
- Empty aliases array omitted
- Empty properties object omitted
- All links filtered out by rel
Test suite now at 89 tests (up from 72), all passing.
Coverage includes RFC 7033 compliance, common use cases (Mastodon/ActivityPub,
OpenID), and edge cases.
