Fix Windows admin permission fallback to prioritize STREAM before mbw

[Copilot]

Problem

Windows functions (WinsatTest and WindowsDDTest) had inconsistent fallback behavior compared to Linux/macOS when no admin permissions were detected. While Linux/macOS functions would first attempt the STREAM method before falling back to mbw, Windows functions would directly use mbw, missing the opportunity to use the higher-performance STREAM test.

This inconsistency meant Windows users without admin privileges couldn't benefit from STREAM testing even when the binaries were available.

Solution

Cross-Platform StreamTest Implementation

• Moved StreamTest and parseStreamOutput functions from macos_linux_mem.go to a new cross-platform stream.go file
• Added Windows-specific binary names including .exe extensions:

  streamBinaries := []string{
      "./stream-windows-amd64.exe",
      "./stream.exe", 
      "stream-windows-amd64.exe",
      "stream.exe",
      // ... fallback to non-.exe variants
  }

Updated Windows Functions

Modified both WinsatTest and WindowsDDTest to follow the same fallback pattern as Linux/macOS:

// Try STREAM first when no admin permission, fallback to mbw if not available
streamResult := StreamTest(language)
if streamResult != "" && strings.TrimSpace(streamResult) != "" {
    return streamResult
}
return simpleMemoryTest(language)

Testing

• All existing tests continue to pass
• Added comprehensive cross-platform tests to verify consistent behavior
• Manual verification confirms Windows functions now attempt STREAM before mbw fallback

Impact

Windows users without admin privileges now have the same testing priority as Linux/macOS users:

1. STREAM (highest performance, no admin required)
2. mbw fallback (if STREAM unavailable)

This ensures consistent, optimal memory testing across all supported platforms.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• hits.spiritlhl.net
  • Triggering command: /home/REDACTED/.cache/go-build/39/3903d80438db21a5bd2ae033e5b068e9e20cfca4e9cb50f1788ed73dff28f37f-d/main -m auto -l en (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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