chore: ignore CLAUDE.md and AGENTS.md in prettier

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: nicklasl

openfeature-provider/js/.prettierignore

@@ -7,3 +7,5 @@ coverage/*
 api/*
 CHANGELOG.md
 README.md
+CLAUDE.md
+AGENTS.md