First implementation (#1)

Reviewed-on: #1

fixtures/packages/writer2027fixed-ynr7.v3/witnesses.json

@@ -0,0 +1 @@
+{"witnesses":[{"id":"tszzg52","kind":"typst","media_type":"application/zip","origin":{"source":"team"},"rights":{"asserted_by":{"by":"ana","evidence":[{"kind":"statement","note":"The team's own draft."}]},"at":"2026-09-15T12:00:00Z","basis":"own-work","format":"scienting-rights/1","license":{"spdx":"CC-BY-4.0"},"uses":{"accessible-copy":true,"ai":{"external/local":true,"external/outside":true,"external/outside-no-retention":true,"external/tenancy":true,"internal/local":true,"internal/outside":true,"internal/outside-no-retention":true,"internal/tenancy":true},"quote-public":true,"read":true,"redistribute":true,"tdm":true},"valid_until":null},"sha256":"aacfff02894cb87cfdb6ed973241ed30a5b59f380663fb264b14b4e06e1a3725","size":4211,"version_label":"draft 3"}]}