Course Transactions

Transactions for the Course system, organized by role.

Roles

Role	Transactions
Owner	Create course, update teachers
Teacher	Manage modules, assess assignments
Student	Enroll, update assignments, claim credentials

Complete Credential Loop

The full course lifecycle for earning a credential:

Owner: Create Course (~45 ADA)
         ↓
Teacher: Manage Modules (~1.86 ADA per module)
         ↓
Student: Enroll (~2.14 ADA)
         ↓
Student: Update Assignment (~0.33 ADA, optional)
         ↓
Teacher: Assess Assignment (~0.21 ADA)
         ↓
Student: Claim Credential (-1.03 ADA refund)

Single credential cost: Student ~1.11 ADA + Teacher ~0.21 ADA = ~1.32 ADA total