Add Windows CI matrix for `scripts/load_test.ps1`

[nanaf6203-bit]

Problem Statement

scripts/load_test.ps1 exists but no Windows runner exercises it.

Why it matters

Cross-platform reliability is a CI responsibility, not an assumption.

Technical Context

Add windows-latest matrix entry to nightly-security-audit.yml.

Expected Outcome

Nightly smoke test runs on Windows.

Acceptance Criteria

1. Job runs pwsh.
2. Script failures fail the workflow.
3. Logs archived.
4. README note.

Implementation Notes

Add matrix entry.

Files or modules likely to be affected

.github/workflows/nightly-security-audit.yml, scripts/load_test.ps1.

Dependencies

None.

Difficulty level

MEDIUM.

Estimated effort

S (~1 day).

[EneGab]

@EneGab has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello maintainer please I'd love to work on this

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

[muhammadawwalabubakar1-oss]

@muhammadawwalabubakar1-oss has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi Maintainer,
I've reviewed the issue and I'm confident I can add the windows-latest CI matrix entry to nightly-security-audit.yml, ensure scripts/load_test.ps1 runs with pwsh, fails the workflow on errors, archives logs, and updates the README. The implementation will meet all the acceptance criteria. Kindly assign this issue to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @muhammadawwalabubakar1-oss to this issue.

[midenotch]

@midenotch has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

This issue aligns well with my experience. I can work on it and submit a polished PR for review.

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[Superray23]

@Superray23 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

can i work on this issue????

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Congratulations, @Superray23! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

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