[SDK] Design a unified transaction builder API across Stellar, Soroban, sponsorship, and multisig flows

[Solomonsolomonsolomon]

Create a higher-level transaction builder surface that can compose core Stellar, Soroban, sponsorship, and multisig operations without forcing integrators into low-level assembly.

[Classique-seyi]

@Classique-seyi has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi maintainer, I'm new to this platform and yet to receive any issue, please assign.

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

[HassanKorey]

@HassanKorey has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi maintainer, kindly assign me this issue.

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

[sokooya]

@sokooya has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I would like to work on this

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

[kaizercodes]

@Kaizer4show has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi maintainer. I would like to take on this task

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Kaizer4show to this issue.

[drips-wave]

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

🧑‍💻 @sokooya: 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.

🌊 Happy Wave 🌊