`cargo-machete` / `cargo-udeps` for unused dependency gate

[usmanimamu17-create]

Problem Statement. Today nothing flags unused dependencies;
nothing flags implicit deps via legacy import paths.

Expected Outcome. Add CI step cargo machete and cargo udeps.

Files: .github/workflows/ci.yml (new step).

[Faithy5]

Hello. I would love to work on this project as I have hands-on experience on it. After reviewing the scope of this issue, I’m confident in my ability to deliver a complete, well-tested solution.

I’d be grateful for the opportunity to contribute and help advance this project. Thank you.

[Ayinkx01]

Hi i would like to work on this issue please assign it to me

[grantfox-oss]

🦊 GrantFox — @Ayinkx 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 #99)
2. Your PR will be reviewed by the ApexChainx maintainers

Good luck! Track your progress on GrantFox.