Map the end-to-end assessment workflow and educator decision points

Document the target workflow from assessment setup through rubric application, evidence review, AI assistance, educator editing, approval, moderation, and release.

### Deliverables
- Workflow map with actors, inputs, outputs, and hand-offs
- Explicit human decision and approval points
- Exception paths for uncertainty, escalation, and reassessment

### Done when
Every consequential decision has a clearly accountable human owner.

Start by mapping the stated workflow from assessment setup through rubric application, evidence review, AI assistance, educator editing, approval, moderation, and release. Identify actors, inputs, outputs, hand-offs, exception paths, and accountable human owners; done means every consequential decision has a clearly accountable human owner.

Written by the indexing model from the issue text.