Add readiness check latency field to response metadata

[Chucks1093]

Summary
Add readiness check latency field to response metadata

Scope

• include readiness check latency in health/readiness metadata\n- keep payload public-safe and concise\n- document new metadata field

Acceptance Criteria

• scoped change is implemented with no unrelated file churn
• docs/tests are updated where applicable
• contributor can validate the outcome locally

Contributor coordination: if you pick this up, reach out in Telegram for updates or clarification: https://t.me/accesslayerorg

[extolkom]

@extolkom has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hey, I can take this on 👍

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[davedumto]

@davedumto has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

can i work on this issue?

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[binayyub4211]

@binayyub4211 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hey maintainer

Can you please assign me I want to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @binayyub4211 to this issue.

[drips-wave]

Congratulations, @davedumto! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @davedumto: 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

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[drips-wave]

This issue has been completed by @davedumto as part of the Stellar Wave Program's 4th Wave 🥳

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