Organize social brand assets

assets/brand/README.md

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+# Scient brand assets
+
+Canonical export files for ScientFactory marketing and social profiles. These files are source
+assets for reuse; they are kept outside `public/` so adding them does not create new website routes.
+
+## Logo
+
+- `logo/scient-profile-picture-1024x1024.png` — square profile image for social accounts.
+- The editable symbol remains [`public/scient-symbol.svg`](../../public/scient-symbol.svg).
+
+## Social headers
+
+- `social/scient-x-header-clean-3000x1000.png` — preferred high-resolution X header upload.
+- `social/scient-x-header-clean-1500x500.png` — standard-size X header fallback.
+
+Both headers use the approved line:
+
+> Research tools and AI agents in one connected workspace.
+
+The two exports have the same 3:1 composition. Prefer the 3000x1000 PNG when the platform accepts
+it; use the 1500x500 PNG when exact recommended dimensions are required.