Move Workspace Hub cover to product section

Author: RichardGeorgeDavis

README.md

@@ -53,10 +53,6 @@ Codex Workspace addresses that with a practical filesystem-first model:
 - Keep WordPress handling pragmatic.
 - Use lightweight manifests where explicit runtime behaviour helps.
 
-<!-- workspace-hub:cover:start -->
-![Codex Workspace cover](.github/assets/cover-readme-20260321.png)
-<!-- workspace-hub:cover:end -->
-
 ## Core Concepts
 
 ### Filesystem-shaped context
@@ -138,6 +134,10 @@ Supporting references:
 
 Workspace Hub is the most concrete product in this repo today. It scans sibling repos, classifies them conservatively, shows runtime and metadata state, and provides start, stop, open, and preview actions without forcing all repos into one toolchain.
 
+<!-- workspace-hub:cover:start -->
+![Codex Workspace cover](.github/assets/cover-readme-20260321.png)
+<!-- workspace-hub:cover:end -->
+
 See:
 - [repos/workspace-hub/README.md](repos/workspace-hub/README.md)
 - [repos/workspace-hub/docs/manifest.md](repos/workspace-hub/docs/manifest.md)