[RealWorldProblems] Develop a tool for seniors to document and share advance care directives

**JTBD:** When I want to ensure my end-of-life wishes (resuscitation preferences, living will, healthcare proxy designation, funeral preferences) are documented, accessible, and understood by the family members who will need to act on them, I want a structured way to record and securely share these documents, so that in a medical crisis my wishes are honoured rather than my family making distressing guesses under pressure. **Context & frequency:** Only ~1 in 3 adults in most Western countries has a documented advance directive. The gap is largest among adults aged 65–80 who have privately considered the issue but haven't acted. It is a one-time task with potentially irreversible consequences if not done. Family members frequently cannot locate the document when it is needed urgently. **Pain / stakes:** Without accessible, clearly communicated advance directives, medical decisions default to what distressed family members and clinicians decide under pressure. This can result in interv