fix(install): convert OSArchitecture enum to string before switch comparison

[largeoliu]

Summary

Fix install.ps1 failing with [ERROR] Unsupported architecture on Windows PowerShell 5.1.

Root Cause

In PowerShell 5.1, System.Runtime.InteropServices.RuntimeInformation.OSArchitecture returns a System.Runtime.InteropServices.Architecture enum value (e.g. X64), not a string. When the switch statement compared the enum directly against string literals "X64" and "Arm64", the comparison failed silently, falling through to the default branch which throws the error.

Fix

Convert the enum to string via .ToString() before the switch comparison:

$arch = [System.Runtime.InteropServices.RuntimeInformation]::OSArchitecture
$archStr = $arch.ToString()
switch ($archStr) {
    "X64"   { return "amd64" }
    "Arm64" { return "arm64" }
    ...
}

Verification

• Locally tested with powershell -File install.ps1 -SkipPathUpdate -Version "v0.5.0" — installed successfully
• All 3 code paths covered: enum-to-string match, env var fallback, and unsupported-arch error

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