docs(releases): 10.4.3 — Open Brainy's first release under the new name, same engine as 10.4.2; The Source is the one registry

RELEASES.md

@@ -31,7 +31,30 @@ is sometimes cited as a 7.x removal — those methods never existed on 7.x; the
 
 ---
 
-## v10.4.2 — 2026-08-28 (a zero-norm vector is not a vector)
+## v10.4.3 — 2026-08-27 (Open Brainy's first release)
+
+**`@soulcraftlabs/brainy` 10.4.3 is the same engine as `@soulcraft/brainy` 10.4.2, byte for
+byte — only the name, the registry, and the pointers changed.** Install:
+
+```bash
+npm install @soulcraftlabs/brainy
+```
+
+with the registry line in your `.npmrc` (anonymous read):
+
+```
+@soulcraftlabs:registry=https://source.soulcraft.com/api/packages/soulcraftlabs/npm/
+```
+
+- **The Source is the one registry.** Open Brainy publishes to source.soulcraft.com only; the
+  npmjs republish step is retired from the release rail. Existing npmjs versions of
+  `@soulcraft/brainy` stay as they are and receive no new versions.
+- **The repository moved** to `soulcraftlabs/open-brainy` on The Source; the old path redirects.
+- **No engine change.** Everything in the 10.4.2 notes applies unchanged; adoption is one
+  install-line change (`@soulcraft/brainy` → `@soulcraftlabs/brainy`), which downstream
+  applications make together with their native-engine bump.
+
+## v10.4.2 — 2026-08-27 (a zero-norm vector is not a vector)
 
 **This is the last release of the MIT engine under the `@soulcraft/brainy` name.**
 The MIT package continues as **Open Brainy** — `@soulcraftlabs/brainy`: the open API,