- Replace *plan-project with *prd, *tech-spec, and *gdd across 15 files
- Add sprint-status documentation for Level 4 projects
- Update workflow diagrams and examples throughout
- Document two-tier status tracking system (workflow-status vs sprint-status)
- Add consistency for prd/tech-spec alternatives in testarch docs
Closes#811
Resolves documentation discrepancies introduced in commits:
- b8db080 (architecture name standardization)
- 419043e (sprint planning)
- ddaefa3 (sprint plan for level 4)