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go.cmd used cmd.exe to invoke PowerShell, which mangled arguments: cmd.exe treats ^ as an escape character (so -run "^$" became -run "$", running all tests instead of none) and = signs also caused issues in the PowerShell→cmd.exe argument passing layer. Replace it with a tiny no_std Rust binary (19KB, 32-bit x86 for universal Windows compat: x86/x64/ARM64) that directly invokes the Tailscale Go toolchain via CreateProcessW. The raw command line from GetCommandLineW is passed through to CreateProcessW with only argv[0] replaced, so arguments are never parsed or re-escaped. The binary also handles first-run toolchain download natively using curl.exe and tar.exe (both ship with Windows 10+), so PowerShell is no longer required for normal operation. The PowerShell fallback is only used for the rare TS_USE_GOCROSS=1 path. PowerShell prefers go.exe over go.cmd when resolving ./tool/go, so this is a drop-in replacement. With go.exe in place, the CI can use the natural -bench=. -benchtime=1x -run="^$" flags directly. Also removes tool/go-win.ps1 which is now unused. Updates #19255 Change-Id: I80da23285b74796e7694b89cff29a9fa0eaa6281 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>