ci cross-platform fix: avoid syscall.SIGHUP usage on windows via build-tagged self-reload helper

pkg/nodes/reload_windows.go

@@ -0,0 +1,8 @@
+//go:build windows
+
+package nodes
+
+// requestSelfReloadSignal is a no-op on Windows (no SIGHUP semantics).
+func requestSelfReloadSignal() error {
+	return nil
+}