fix: replace codex install artwork

Author: avalonreset

CHANGELOG.md

@@ -25,6 +25,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/).
 - Simplified Codex GitHub marketing copy so the public package presents as a Codex product while keeping Claude Code compatibility documented separately.
 - Expanded the Codex GitHub install experience image to the full README content width.
 - Replaced the square wolf mark with a distinct GPT Image 2 full-wolf mascot graphic.
+- Replaced the install experience image with esoteric low-poly wolf system artwork.
 
 ## [1.2.0] - 2026-03-16