feat: documents and session tokens

spec/21-drafts.md

@@ -14,4 +14,4 @@ Authors rewrite constantly, and IDs must survive without cluttering the source.
 IDs live in a sidecar, `ids.jsonl` in the Typst project, `scienting-draft-ids/1`: one line per sentence with its `id`, its `text_hash`, its `section` and its `ord`, and `pinned` when the author fixed the ID to a label.
 Each conversion aligns the new sentences with the previous revision, exact text first and then by edit distance within the section; an edited sentence keeps its ID and gets a new hash, so its annotations reattach or go stale as [6.5](06-anchors.md#65-resolution) says.
 
-Both formats are provisional until the Typst package exists.
+Both formats are `provisional` ([0.4](00-introduction.md#04-status)).