Add CCX concepts, fix errors around CCX#247

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bmtcril wants to merge 6 commits intomainfrom

bmtcril/handle_ccx

Commits on Apr 2, 2026

feat: Add CCX concepts
Tycho Hob
committed

Commits on Apr 3, 2026

style: Fix formatting
Tycho Hob
committed
refactor: Clarify migration command output
Tycho Hob
committed
style: Use a generator for checking valid course key input
Tycho Hob
committed
test: Pick up coverge changes
Tycho Hob
committed
build: Remove Django 4.2 tests, we no longer support it
Tycho Hob
committed