[TD-07] Add missing test cases

[licette32]

Missing tests

The current 8 tests cover the happy path and some errors. The following are missing:

• register_technician twice → must fail (PDA already exists)
• decommission_asset with vault containing locked SOL → does it fail or allow?
• complete_maintenance with unregistered technician → must fail
• complete_maintenance with a technician signer different from the expected one → must fail
• report_issue twice on the same asset → must fail (status != Active)

File

tests/medovant.test.ts

Milestone: v1.1