improve: #3586488: Sprint management improvements + remove marketing templates

Jeremy Chinquistrequested to merge
3586488-sprint-change-workflow into main

Summary

  • Add Total / Average bold summary row to Aggregate Statistics table in sprint-stats report
  • Remove 5 Marketing issue templates (now live exclusively in project/ai_initiative_marketing)
  • Sprint-change workflow updates to close-milestone skill (from earlier commits)

Related

Drafted with the assistance of AI (Claude Code / Opus 4.7).

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