WIP Proposal: Unified `authoring` app#454

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ormsbee wants to merge 26 commits intoopenedx:mainfrom

ormsbee:big-authoring

Commits on Dec 28, 2025

temp: basic setup stuff
ormsbee
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Commits on Dec 29, 2025

Commits on Jan 7, 2026

temp: more comments
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Commits on Jan 9, 2026

Commits on Jan 13, 2026

Commits on Jan 14, 2026

docs: add readme to explain backcompat package
ormsbee
committed

Commits on Jan 16, 2026

docs: update ADR
ormsbee
committed
test: move a chunk of the backfill API into the migration file to avoid conflict with changed model location
ormsbee
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