various changes

fixed PLCImporter

yard docs, marked some methods as private

resolve_handle accepts a did, added operation #seq, fixed errors on Ruby <3.2

changes in “*valid*” methods, account status methods, added pds_host, DID#document etc.

PLCImporter error handler, DID#get_audit_log

DID#is_known_by_relay? and account_exists?

validation fixes, stdlib gems in gemspec

PLCImporter, parsing labeler endpoints

various fixes to handle validation

Resolver class, validating handles from the doc

Document#handles, DID#resolved_by, DID#did, DID#web_domain

fixes

first working prototype