Pull course sections and enrolled students from Ellucian Colleague via Ethos REST API

Steps

1. Obtain an Ethos API key scoped to your Colleague integration from the Ethos Integration Hub and authenticate by POSTing the key to the Ethos auth endpoint to receive a short-lived JWT
2. GET /api/sections with Accept: application/vnd.hedtech.integration.v{n}+json to retrieve the list of course sections; use limit and offset query parameters to page through results
3. For each section, record the id (GUID) and note the course, academicPeriod, and instructors embedded in the response
4. GET /api/section-registrations?section={sectionGuid}&limit=100 to retrieve all student registrations for a section; repeat with offset for large sections
5. Extract the registrant person GUIDs and GET /api/persons/{guid} to resolve student identity attributes such as credentials and names
6. Handle change-data events by polling the Ethos change-log endpoint for new section-registration events rather than re-fetching full payloads