Add Aegis invalid input matrix tests

[El-swaggerito]

Description

Difficulty: Expert

Type: Test

Summary

Add invalid input matrix tests across Aegis contract functions.

Current Behaviour

Invalid inputs may not be tested consistently across compliance, minting, assets, roles, transfers, and metadata.

Expected Behaviour

Contracts should reject malformed, zero, oversized, unauthorised, and invalid-state inputs without corrupting state.

Suggested Implementation

Create invalid input matrix tests and documentation.

Files or Areas Likely Affected

• src/
• tests/
• docs/

Acceptance Criteria

• Invalid input matrix is added.
• Compliance functions are covered.
• Minting and asset functions are covered.
• Role and transfer functions are covered.
• State remains unchanged after failures.
• Docs reference invalid input coverage.

Additional Notes

This is audit-readiness work.

[theseven7h]

I have read the description and have a solid understanding of what's needed. Expect a PR in 24hours

[grantfox-oss]

🦊 GrantFox — @theseven7h 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 #167)
2. Your PR will be reviewed by the Axionvera maintainers

Good luck! Track your progress on GrantFox.