chore(config): remove co-authors config (#303)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: wphillipmoore

vergil.toml

@@ -5,9 +5,6 @@ branching-model = "library-release"
 release-model = "artifact-publishing"
 primary-language = "java"
 
-[project.co-authors]
-agent = "Co-Authored-By: wphillipmoore-agent <284101533+wphillipmoore-agent@users.noreply.github.com>"
-
 [ci]
 versions = ["17", "21"]
 integration-tests = true