chore: add Frame.dev/AgentOS branding headers to registry READMEs

Author: jddunn

registry/README.md

@@ -1,7 +1,23 @@
+<div align="center">
+
+<p align="center">
+  <a href="https://agentos.sh"><img src="../../logos/agentos-primary-no-tagline-transparent-2x.png" alt="AgentOS" height="64" /></a>
+  &nbsp;&nbsp;&nbsp;
+  <a href="https://frame.dev" target="_blank" rel="noopener"><img src="../../logos/frame-logo-green-no-tagline.svg" alt="Frame.dev" height="40" /></a>
+</p>
+
 # AgentOS Extension Registry
 
 The official registry of extensions compatible with the AgentOS extension architecture.
 
+*The OS for humans, the codex of humanity.*
+
+[Frame.dev](https://frame.dev) • [AgentOS](https://agentos.sh)
+
+</div>
+
+---
+
 ## 📚 Understanding Extensions
 
 ### What are Extensions?

registry/community/README.md

@@ -1,7 +1,23 @@
+<div align="center">
+
+<p align="center">
+  <a href="https://agentos.sh"><img src="../../../logos/agentos-primary-no-tagline-transparent-2x.png" alt="AgentOS" height="64" /></a>
+  &nbsp;&nbsp;&nbsp;
+  <a href="https://frame.dev" target="_blank" rel="noopener"><img src="../../../logos/frame-logo-green-no-tagline.svg" alt="Frame.dev" height="40" /></a>
+</p>
+
 # Community Extensions
 
 Open-source extensions contributed by the AgentOS community.
 
+*The OS for humans, the codex of humanity.*
+
+[Frame.dev](https://frame.dev) • [AgentOS](https://agentos.sh)
+
+</div>
+
+---
+
 ## Categories
 
 ### 🔬 Research

registry/curated/README.md

@@ -1,7 +1,23 @@
+<div align="center">
+
+<p align="center">
+  <a href="https://agentos.sh"><img src="../../../logos/agentos-primary-no-tagline-transparent-2x.png" alt="AgentOS" height="64" /></a>
+  &nbsp;&nbsp;&nbsp;
+  <a href="https://frame.dev" target="_blank" rel="noopener"><img src="../../../logos/frame-logo-green-no-tagline.svg" alt="Frame.dev" height="40" /></a>
+</p>
+
 # Curated Extensions
 
 Official and verified extensions maintained by Frame.dev and trusted partners.
 
+*The OS for humans, the codex of humanity.*
+
+[Frame.dev](https://frame.dev) • [AgentOS](https://agentos.sh)
+
+</div>
+
+---
+
 ## Categories
 
 ### 🎯 Core