Drop the CLAUDE.md ignore rule from the upstream branch

It refers to a file that exists only in the fork's working copy.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XPXp7y4xQY8xm8mnj5i4qU

Author: drmayu7

.gitignore

@@ -4,4 +4,3 @@
 .settings
 .superpowers
 .env
-CLAUDE.md