Add Windows platform integration scaffolding

config/notification_unix.go

@@ -0,0 +1,7 @@
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
+
+package config
+
+func defaultNotifyCommand() string {
+	return "/usr/share/barnard/barnard-sound.sh \"%event\" \"%who\" \"%what\""
+}

config/notification_windows.go

@@ -0,0 +1,9 @@
+//go:build windows
+
+package config
+
+// Windows installations do not ship the POSIX notification helper. Users can
+// configure a cmd.exe-compatible command explicitly if they want notifications.
+func defaultNotifyCommand() string {
+	return ""
+}

config/user_config.go

@@ -148,7 +148,7 @@ func (c *Config) LoadConfig() {
 		jc.Username = &username
 	}
 	if c.config.NotifyCommand == nil {
-		ncmd := string("/usr/share/barnard/barnard-sound.sh \"%event\" \"%who\" \"%what\"")
+		ncmd := defaultNotifyCommand()
 		jc.NotifyCommand = &ncmd
 	}
 	if c.config.NoiseSuppressionEnabled == nil {