Draft and accept the Business Case, Stakeholder Analysis (S01-S03) and
Project Plan for the Day 15 coffee machine assignment. Add three
milestones with 17 tasks, synced to the git host as Milestones 40-42
and Issues #1-#17. Register PP and MIL in the artifact registry and set
the PO language to en.
No issue closed: planning only, no code changed.