feat: migrate to golang

internal/subscription/ctime_windows.go

@@ -0,0 +1,19 @@
+//go:build windows
+
+package subscription
+
+import (
+	"os"
+	"syscall"
+	"time"
+)
+
+// creationTime returns the file's creation time on Windows, matching
+// Python's stat.st_ctime on Windows (which is creation time on this
+// platform, per subscription_manager.py:273-278).
+func creationTime(info os.FileInfo) time.Time {
+	if stat, ok := info.Sys().(*syscall.Win32FileAttributeData); ok {
+		return time.Unix(0, stat.CreationTime.Nanoseconds())
+	}
+	return info.ModTime()
+}