Refresh repository cover and preview assets

Author: RichardGeorgeDavis

.github/assets/README.md

@@ -2,6 +2,10 @@
 
 `social-preview.png` is the repository social preview image sized for GitHub's recommended 1280 x 640 layout.
 
+`cover-readme-20260321.png` is the current versioned README cover image used to avoid stale GitHub image caching on the repository page.
+
+`social-preview.svg` is the editable source for the current social preview artwork, including the refreshed visible-context project framing.
+
 Use it in:
 
 1. Repository `Settings`

.github/assets/cover-readme-20260321.png

@@ -1,7 +1,7 @@
 # Codex Workspace
 
 <!-- workspace-hub:cover:start -->
-![Codex Workspace cover](cover.png)
+![Codex Workspace cover](.github/assets/cover-readme-20260321.png)
 <!-- workspace-hub:cover:end -->
 
 Codex Workspace is a local-first workspace structure for managing many standalone repositories on one machine without forcing them into a monorepo.

.github/assets/social-preview.png

@@ -2,6 +2,10 @@
 
 ## 2026-03-21
 
+- Expanded the public project framing across the root docs to describe the filesystem-first context model, observable retrieval, and tracked-versus-local memory rules more directly.
+- Added cross-agent skills and MCP guidance plus a context-cache and retrieval note for generated summaries and provenance.
+- Refreshed the README cover path with a versioned asset to avoid stale GitHub image caching.
+- Updated the repository social preview artwork to match the current project framing.
 - Moved the canonical workspace handover docs from `tools/docs/` to the root `docs/` folder.
 - Removed the duplicated documentation links from `shared/` so it acts as a metadata-only layer.
 - Rewrote the repo root `README.md` to behave more like a public project homepage.