chore: remove CLAUDE.md from public repo

Internal development rules do not belong in a public repository.
File is kept locally and added to .gitignore.

Author: iamtoruk

.gitignore

@@ -16,6 +16,7 @@ Thumbs.db
 # Planning artifacts (internal, not shipped)
 docs/superpowers/
 .claude/
+CLAUDE.md
 
 # Config / secrets
 .env