[SDK] Implement SDK Error Contextualization (Horizon codes)

[Solomonsolomonsolomon]

Enhance SDK error objects to automatically map Horizon result codes (e.g. op_underfunded) to clear, actionable developer errors.nn- Priority: High

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[blessme247]

@blessme247 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I would like to resolve this issue

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Congratulations, @blessme247! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

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[blessme247]

@Solomonsolomonsolomon In which file am I expected to work ?