Add shared helper for route-safe unknown error mapping

[Chucks1093]

Summary
Add shared helper for route-safe unknown error mapping

Scope

• add helper mapping unknown errors to safe API error envelopes\n- include route context id for debugging\n- keep existing known-error mappings intact

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

[shaaibu7]

@shaaibu7 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

can i work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @shaaibu7 to this issue.

[JohnOluB]

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

I’ll create a shared helper that maps unknown errors into safe, consistent API error envelopes while preserving existing known error mappings.

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

[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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[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.

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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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