Add a CODEOWNERS file

[N-thnI]

Description

Add per-path review ownership so security-sensitive control-plane changes route to the right reviewers.

Problem Statement

This repo has no CODEOWNERS file. It holds treasury governance, nonce/sequence management, and RPC failover logic — changes here carry meaningfully different risk than a docs change, but there's no documented owner routing.

Proposed Changes

• Add .github/CODEOWNERS mapping security-sensitive paths (engine-core/src/treasury.rs, nonce/RPC-related files, governance files) and each major module
• For "responsible reviewers": there's no per-module maintainer subdivision yet, so default every path to the two current org maintainers — @N-thnI @N-i-xx

Technical Implementation Scaffolding

• Target Repository: vero-core-engine
• Target Path: .github/CODEOWNERS
• Branch Naming: chore/issue--add-codeowners
• Authority Context: Repository hygiene / non-code

Acceptance Criteria

• .github/CODEOWNERS exists and covers every top-level module and security-sensitive files
• GitHub recognizes the file with no syntax errors

Definition of Done

• Reviewed by lead maintainer
• Pull request merged via verified status check

[Primex-Tech]

I will love to fix this issue

[grantfox-oss]

🦊 GrantFox — @Primex-Tech has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #210)
2. Your PR will be reviewed by the Vero-protocol maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

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

@Primex-Tech's PR #218 was approved and merged by @N-thnI.

🏆 @Primex-Tech: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (414 total points). Track your full progress on GrantFox.

👏 Great work, @Primex-Tech! Keep contributing to Vero-protocol.