degree requirements: data model, versioned by catalog year

[jaspermayone]

From the ScheduleLab partnership call (2026-08-13): WIT Calendar will track degree requirements. ScheduleLab has no user state. We store the catalog and pass it to them.

What to build

Store degree requirements per major, versioned by catalog year. A 2026 CS student and a 2024 CS student can have different requirements. Keep historical catalog years.

Suggested shape:

• DegreeProgram (major, school)
• RequirementSet (degree program + catalog year)
• Requirement entries that map to courses (required course, elective group, credit-hour rule)

Notes

• Wentworth is implementing Stellic for degree audits. We only store and serve the data; ScheduleLab handles audit logic.
• Related: "nodes" for course prereq #448 (course prereq nodes), implement a curriculum graph #449 (curriculum graph).

Meeting notes: https://notes.granola.ai/t/6aa6ed59-eaad-4cea-86cd-1fcb7c327f89-00demib2