Reduce contract binary size

[Samuel1-ona]

Optimize compiled WASM binary size for lower deployment costs.

Acceptance Criteria:

• Audit current binary sizes for all three contracts
• Remove unused dependencies
• Use wasm-opt with size optimization
• Target < 64KB per contract if possible

[odarome132]

@odarome132 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi maintainer, I’d like to work on this issue. I have experience optimizing Rust/WASM projects and improving smart contract build outputs. Looking forward to contributing.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @odarome132 to this issue.

[drips-wave]

Congratulations, @odarome132! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @odarome132: 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.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

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