Add GrantFox issue quality validator

[El-swaggerito]

Description

Difficulty: Expert

Type: Feature

Summary

Add a local validator for GrantFox-style advanced issue JSON files.

Current Behaviour

Issue batches can contain missing fields, unsupported labels, weak acceptance criteria, or low-value tasks.

Expected Behaviour

AnchorKit automation should validate issue batch structure and issue quality before creation.

Suggested Implementation

Create issue schema validation, label validation, complexity checks, acceptance criteria checks, script output, tests, and documentation.

Files or Areas Likely Affected

• scripts/
• issues/
• docs/
• tests/
• package.json

Acceptance Criteria

• Issue batch schema validator is implemented.
• Unsupported labels are detected before GitHub issue creation.
• Missing required fields are reported clearly.
• Weak acceptance criteria are flagged.
• Tests cover valid and invalid issue batches.
• Documentation explains the advanced issue standard.

Additional Notes

This should prevent missing-label failures during issue creation.

[Alimzy]

Hi! I'd like to work on this issue.

I'm a software engineer with hands-on experience in testing, debugging, and building reliable features across the stack. I'm confident I can take this on and deliver a solid, well-tested solution that follows the project's existing conventions.

I'll make sure to cover the core functionality as well as relevant edge cases to keep things reliable and regression-resistant.

Let me know if I can get started, and I'll provide updates as I progress.

[grantfox-oss]

🦊 GrantFox — @Alimzy 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 #64)
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!

@Alimzy's PR #81 was approved and merged by @El-swaggerito.

🏆 @Alimzy: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (293 total points). Track your full progress on GrantFox.

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