Add a CI pipeline performance optimization (caching, parallelism)

[Marvy247]

Optimize CI: cache Rust target directories, Noir artifacts, node_modules. Parallelize contract tests, circuit checks, and frontend lint/build across different CI runners.

[Luchi5544]

@Luchi5544 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello boss, please assign me to work on this issue.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Luchi5544 to this issue.

[zachyo]

@zachyo has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

hi, I would like to work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @zachyo to this issue.

[drips-wave]

Congratulations, @zachyo! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @zachyo: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

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