Remove CLAUDE.md from version control and .gitignore it

CLAUDE.md contains local Claude Code project instructions that are
specific to the maintainer's workflow, not relevant to users.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: CodeReclaimers

.gitignore

@@ -31,4 +31,7 @@ dist
 neat_python.egg-info
 
 # Progress logs (local working notes, not committed)
-progress-*.md
+progress-*.md
+
+# Claude Code project instructions (local)
+CLAUDE.md