Simplify CLA signing instructions to only mention comment mechanism

Author: claude

CLA/version_1/CLA_SIGNATORIES.md

@@ -12,9 +12,7 @@ This file tracks individual contributors who have signed the Contributor License
 
 ## How to Sign
 
-1. **Automated Method (Recommended)**: When you submit your first pull request, the CLA Assistant bot will guide you through signing the CLA electronically.
-
-2. **Manual Method**: Add your GitHub username to the table above by creating a pull request. Your PR will be reviewed and merged once verified.
+When you submit your first pull request, the CLA Assistant bot will guide you through signing the CLA electronically by commenting on your PR.
 
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