[docs] update some documentation about versions

CLAUDE.md

@@ -44,6 +44,20 @@
 - Changesets manage versions and changelogs
 </architecture>
 
+<game-clients>
+Supported client builds live in `SUPPORTED_GAME_VERSIONS`
+(`packages/domain/src/presence-db.ts`); `GAME_VERSION` is the default the stack targets.
+
+- `20230414` — default, official. Manifest `7859140924515540835` (2023).
+- `20250718.01` — beta, official. Manifest `1151455856673601091`; reaches this server via
+  the [patch-2025](https://github.com/recflare/patch-2025) patch.
+- `20250424.01`, `20231207`, `20230616` — alpha.
+
+Builds are date-stamped (`YYYYMMDD[.NN]`) so they order as plain strings; several
+surfaces gate on "newer than `20230414`" (econ storefront catalog, `api` event tags,
+`rooms` featured rooms) rather than on an explicit list.
+</game-clients>
+
 <code-style>
 - Use tabs for indentation, spaces for alignment
 - Type imports use `import type`