T10: Brand assets (Open Design)

[realproject7]

Parent: EPIC #1. Route: Open Design → gate/design asset. No code dependency.

Goal

Produce brand assets for the OSS repo and README.

Scope

• Logo/wordmark for "svgsmith" (the smith/forge metaphor — clean, geometric, vector-native), README hero image, GitHub social preview (1280×640).
• Generated via Open Design (MANUAL-open-design-media-api.md), stored in ~/Projects/z-design/svgsmith-design/ (icons/, screens/, system/), never inside the code repo.
• Final exported PNG/SVG referenced from README and set as the repo social preview.

Acceptance

• Asset package in z-design/svgsmith-design/; README hero + social preview applied to the repo.