Add contract contribution quality gate

[El-swaggerito]

Description

Difficulty: Expert

Type: Test

Summary

Add a contribution quality gate for PocketPay contract issues.

Current Behaviour

Merged contract PRs may include small changes without enough tests or with failing checks.

Expected Behaviour

The contracts repo should provide objective criteria for payment-ready work, including meaningful implementation, passing tests, and acceptance criteria coverage.

Suggested Implementation

Create quality gate documentation, PR template references, contract-specific testing expectations, and examples of incomplete work.

Files or Areas Likely Affected

• docs/
• .github/
• README.md
• tests/
• Makefile

Acceptance Criteria

• Contract quality gate checklist is added.
• Checklist covers implementation, tests, CI, and acceptance criteria.
• Contract-specific test expectations are included.
• PR template references the quality gate.
• Examples of incomplete work are documented.
• README links to the quality gate.

Additional Notes

This helps prevent low-effort merged PRs from being treated as automatically approved.

[abbarrh01]

I have experience in React and I have reviewed the code. I will submit a PR as soon as I am assigned

[grantfox-oss]

🦊 GrantFox — @abbarrh01 has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #484)
2. Your PR will be reviewed by the Axionvera 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 | FWC26 campaign!

@abbarrh01's PR #520 was approved and merged by @El-swaggerito.

🏆 @abbarrh01: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (188 total points). Track your full progress on GrantFox.

👏 Great work, @abbarrh01! Keep contributing to Axionvera.