Update AUTHORS.md

AUTHORS.md

@@ -4,16 +4,6 @@
 
 - **Trang Bui** — dataset creator, benchmark and environment designer, release
   maintainer, and author of the current four-domain beta release.
-
-The DOI for `4.0.0-beta.2` should use the current-release author list above.
-
-## Planned domain expansion
-
 - **Tran Ngoc Cam Nguyen** — planned domain lead for **Multi-hop Knowledge** and
-  **Document/Media** in a future Track B release.
 
-These two domains are not included in `4.0.0-beta.2`. Tran Ngoc Cam Nguyen
-should be added to the DOI author list when the corresponding domain artifacts,
-live trajectories, review records, and release metadata are published in a new
-version. No ORCID is currently recorded; an ORCID is optional and can be added
-later without changing the contributor's displayed name.
+The DOI for `4.0.0-beta.2` should use the current-release author list above.