Add performance benchmarks and gas cost documentation for contract operations

[Emeka000]

Summary

There are no documented baseline performance metrics for any contract operation. Developers and integrators have no reference for expected gas costs, latency, or resource consumption, making it difficult to optimize or budget for transactions.

Benchmarks to Document

• Patient registration (single and batch)
• Health record creation and retrieval (by type, by record ID)
• Consent grant/revoke cycle
• Prior authorization request → approval flow
• Analytics report job (small, medium, large dataset)

Acceptance Criteria

• Benchmark harness integrated into the Makefile (make bench)
• Results documented in docs/benchmarks.md with methodology
• CI records benchmark results as artifacts for regression tracking
• Gas costs are expressed in both raw instructions and approximate XLM cost

[rasputin2525]

@rasputin2525 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

hi team kindly assign me i can work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @rasputin2525 to this issue.

[drips-wave]

Congratulations, @rasputin2525! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @rasputin2525: 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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