chore: remove CLAUDE.md from tracking and gitignore it

Committed inadvertently via `git add -A`. The file is a local
Claude-Code-specific instruction sheet, not meant for the repo.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: cailmdaley

.gitignore

@@ -134,3 +134,4 @@ dmypy.json
 *shapepipe_run_*
 *shapepipe_runs*
 code
+CLAUDE.md