core: implement full e2e test suite for loan lifecycle

[EmeditWeb]

Problem

There are no end-to-end tests covering the complete
loan lifecycle from auth through repayment.

What To Build

Create test/e2e/loan-lifecycle.e2e-spec.ts covering:

1. Auth flow (nonce + verify)
2. Learner profile
3. Vendor setup
4. Loan application
5. Loan approval
6. Installment repayment
7. Reputation check
8. Full repayment

Files To Touch

• test/e2e/loan-lifecycle.e2e-spec.ts (new)
• test/e2e/helpers/test-wallet.ts (new)
• test/e2e/helpers/test-setup.ts (new)

Acceptance Criteria

• Full lifecycle test runs against live testnet
• Each step verified before proceeding
• No test secrets committed to repo
• npm run build passes

Mandatory Checks Before PR

• All e2e tests pass
• npm run build passes
• PR references this issue

[Adeyemi-cmd]

hello maintainer. i would love to work on this

[grantfox-oss]

🦊 GrantFox — @Adeyemi-cmd has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #28)
2. Your PR will be reviewed by the StepFi-app maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@Adeyemi-cmd's PR #52 was approved and merged by @EmeditWeb.

🏆 @Adeyemi-cmd: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (188 total points). Track your full progress on GrantFox.

👏 Great work, @Adeyemi-cmd! Keep contributing to StepFi-app.