the protocol/service split: zat.ArchiveBackfill (and the vendored libzstd, the streamplace example) moved to tangled.org/zat.dev/jetstream — the zig jetstream service SDK — where its unreleased improvements ship as jetstream 0.1.0. breaking for archive consumers: depend on the jetstream package. zat.JetstreamClient (v1 /subscribe) remains, deprecated-in-home. new: zat.Datetime — the atproto datetime profile as a first-class syntax type (parse -> unix-epoch microseconds with offsets normalized and the spec's year-zero floor on the normalized instant; toString -> canonical .ffffffZ). interop datetime fixtures now drive the real parser. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>