invokeContract: opt-in Retry-After-aware rate-limit handling test

[Jaydbrown]

Cover the 429 path end-to-end once withRetry honours Retry-After.

[Zuno2026]

@Zuno2026 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi, I’ve gone through the issue and I’m confident I can get it sorted out quickly.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Zuno2026 to this issue.

[graceanya796-maker]

@graceanya796-maker has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello
I would love to work on this issue please

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[LiegeFx]

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

Hi Maintainer, I have gone through the details, and I can assure you I can get it done, kindly assign it to me

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

[bade22brazy]

@bade22brazy has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

hello maintainer, kindly assign these issues to me. i am sure of handling thenm after careful and thorough review

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[drips-wave]

Congratulations, @bade22brazy! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @bade22brazy: 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.

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