add CLAUDE.md in .pm to ensure that if tasks or
  milestones are done, they should be moved to their
  done folders

make /pm and /pm-brainstorm Canonical and do not duplicate each other, so that /pm-brainstorm can handover the task orchestration and planning to the /pm after brainstorming. And /pm should always append one task to /simplify, and another to improve test coverages (do not hack but add meaningful tests).