feat: add contract versioning

[N-thnI]

Description
Track logic version.

Problem Statement
Version mismatch.

Technical Requirements

• Version constant.

Implementation Guide

• Suggested Approach: Version getter.
• Affected Areas: src/

Acceptance Criteria

• Correct version returned.

Security & Audit Considerations

• None.

Definition of Done

• Version tracked.

[primexk5]

gm, I'd like to take this on.

Plan: add a version constant in src/ and a public version getter that returns it, so the contract's logic version can be queried on-chain and checked against expectations to catch version mismatches. I'll have a quick look at the existing contract structure first to place the constant and getter conventionally, and add a test asserting the correct version is returned.

Comfortable with Rust/Soroban. Can have a PR up shortly.

[grantfox-oss]

🦊 GrantFox — @primexk5 has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #16)
2. Your PR will be reviewed by the Vero-protocol maintainers

Good luck! Track your progress on GrantFox.

[primexk5]

Resolved by #64, which has been merged. Closing as completed.

[primexk5]

This was resolved by #64, which has been merged. Can a maintainer please close this out as completed?