Make Windows service uninstall idempotent

Treat sc.exe delete error 1060 as success when the service is
already absent so repeated uninstalls do not fail.

Signed-off-by: Bryan Frimin <bryan@probo.com>

pkg/deviceagent/service/service_windows.go

@@ -67,7 +67,12 @@ func Uninstall(cfg Config) error {
 	name := DefaultWindowsName
 	_ = exec.Command("sc.exe", "stop", name).Run()
 	if out, err := exec.Command("sc.exe", "delete", name).CombinedOutput(); err != nil {
-		return fmt.Errorf("cannot run sc.exe delete: %w: %s", err, strings.TrimSpace(string(out)))
+		msg := strings.TrimSpace(string(out))
+		if isWindowsServiceMissing(msg) {
+			return nil
+		}
+
+		return fmt.Errorf("cannot run sc.exe delete: %w: %s", err, msg)
 	}
 	return nil
 }

pkg/deviceagent/service/validate_windows.go

@@ -0,0 +1,24 @@
+// Copyright (c) 2025-2026 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package service
+
+import "strings"
+
+func isWindowsServiceMissing(out string) bool {
+	lower := strings.ToLower(out)
+	return strings.Contains(lower, "1060") ||
+		strings.Contains(lower, "does not exist as an installed service") ||
+		strings.Contains(lower, "specified service does not exist")
+}