Architecture: split contract.rs facade from duplicated constants

[josephchimebuka]

Summary

contract.rs still redefines windows/caps constants that live in common.rs. Single-source the constants.

Acceptance criteria

• Constants defined once
• Facade only re-exports or uses common
• No behavior change

Where

• contracts/src/contract.rs
• contracts/src/common.rs

[yusufadeagbo]

@yusufadeagbo has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

May I please work on this?

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[Guddy1-tech]

@Guddy1-tech has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I have experience working with JavaScript/TypeScript, Git, and open-source projects. I would first review the existing sync flow and understand how multiple instances currently interact, then implement leader election so only one instance performs active synchronization while the others remain passive. I would also add tests to verify leader selection, failover, and that duplicate sync activity is prevented.

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[Akpamgbo]

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Can I take on this issue?

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