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+++ b/.gitignore
@@ -4,6 +4,7 @@
 ## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore
 
 .research/
+.DS_Store
 
 # User-specific files
 *.rsuser
diff --git a/CLAUDE.md b/CLAUDE.md
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--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -2,6 +2,14 @@
 
 This file provides guidance to AI agents when working with code in this repository.
 
+## Commit Authorship
+
+All AI-authored commits MUST use:
+
+```
+Co-Authored-By: Svrnty Inc. <eng@svrnty.com>
+```
+
 ## Project Overview
 
 This is Svrnty.CQRS, a modern implementation of Command Query Responsibility Segregation (CQRS) for .NET 10. It was forked from PoweredSoft.CQRS and provides:
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