EPIC: Course and source spine (VS-1/VS-2)

[kmosoti]

Outcome

A user can create a course, upload a file, process it, and view persisted source spans.

Scope

• Course, Source, SourceSpan models
• Course API and source API
• Loader contract
• PDF and text loaders
• Chunker
• Source processing statuses
• Source upload/status UI

Source Docs

• docs/01-requirements.md: Courses, Sources And Spans
• docs/04-roadmap-and-milestones.md: Milestone 1

Done When

• Course create/list/detail works through API and UI.
• PDF and text sources produce SourceSpan rows.
• Processing status is visible.
• Empty/scanned PDF failure is understandable.