implement s390x assembly for CGO-less

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[github-actions]

✅ Patch Consistency Review - PASSED

I've completed a thorough review of the patch file changes in this PR. The implementation of s390x assembly for CGO-less OpenSSL support maintains excellent consistency across all patch files.

What was reviewed:

1. Vendor patch consistency ✅

   • All s390x assembly files correctly added to 0001-Vendor-external-dependencies.patch
   • go.mod version updated appropriately
   • Follows the same pattern as other architectures (arm64, ppc64le, riscv64)

2. Cross-patch consistency ✅

   • 0003-Implement-crypto-internal-backend.patch correctly updated to:
     • Add s390x to the test architecture list
     • Include s390x in the build tag exclusion list
     • Update documentation strings with s390x support

3. Documentation consistency ✅

   • eng/doc/NocgoOpenSSL.md updated with s390x support
   • Error messages updated to reflect the new architecture

4. Pattern adherence ✅

   • Changes follow the exact same pattern as previous architecture additions (riscv64, ppc64le)
   • No redundant patches or missing updates detected

Summary:

No consistency issues found. The PR properly maintains cross-patch consistency and follows established conventions. The s390x implementation is correctly split between the vendor patch (assembly implementations) and the crypto backend patch (build configuration and tests).

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