Add Aegis Contracts test-first contribution guide

[El-swaggerito]

Description

Difficulty: Expert

Type: Documentation

Summary

Create a test-first contribution guide for Aegis Contracts.

Current Behaviour

Contributors may update compliance registry, RWA assets, minting, transfer restrictions, roles, metadata, and events without adding meaningful tests.

Expected Behaviour

The repo should explain when tests are required, what type of tests are expected, and how contributors should prove the behaviour works.

Suggested Implementation

Add documentation with testing examples, no-test justification rules, negative-path expectations, and local commands.

Files or Areas Likely Affected

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

Acceptance Criteria

• Test-first contribution guide is added.
• Testing expectations for compliance registry, RWA assets, minting, transfer restrictions, roles, metadata, and events are documented.
• Happy-path and negative-path test expectations are included.
• No-test justification rules are documented.
• Local test commands are included.
• README links to the guide.

Additional Notes

This addresses under-tested merged PRs.

[ugoocreates-pixel]

So based on this description, with my experience, this shouldn't be an issue. I ask that you assign me to this issue

[grantfox-oss]

🦊 GrantFox — @ugoocreates-pixel 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 #141)
2. Your PR will be reviewed by the Axionvera maintainers

Good luck! Track your progress on GrantFox.

[El-swaggerito]

Assigned to @ugoocreates-pixel. Please follow the acceptance criteria and submit a clean PR linked to this issue.