feat: add SetUsage to support custom help descriptions in CLI (by AI)

README.md

@@ -64,6 +64,7 @@ func main() {
 - **Trace ID Propagation**: Automatically generates a shared Trace ID for all services during startup, ensuring log correlation.
 - **Secure IPC**: Token-based Unix Domain Socket for `status` and `kill` commands.
 - **Zero Configuration PID**: Automatic PID management in the system temporary directory.
+- **Embedded Log Writer**: Automatically registered log writer service with high priority (-100).
 
 ## Commands
 

starter.go

@@ -29,6 +29,7 @@ var (
 	// Default configuration
 	appName    = filepath.Base(os.Args[0])
 	appVersion = "1.0.1"
+	appUsage   = ""
 
 	// Internal state
 	commands = make(map[string]*command)
@@ -64,6 +65,9 @@ func init() {
 	AddCommand("restart", "Restart the service", restartCmd)
 	AddCommand("status", "Show service status", statusCmd)
 	AddCommand("kill", "Send signal to a specific service: kill <svc_name> <signal_num>", killCmd)
+
+	// Auto-register log writer service with high priority
+	Register("log-writer", log.WriterService, -100, 0, 0)
 }
 
 // Register adds a service to be managed by the starter.
@@ -83,6 +87,11 @@ func SetAppInfo(name, version string) {
 	appVersion = version
 }
 
+// SetUsage sets custom usage text to be displayed in help.
+func SetUsage(text string) {
+	appUsage = text
+}
+
 // AddCommand adds a custom command.
 func AddCommand(name, desc string, fn func()) {
 	commands[name] = &command{name: name, desc: desc, fn: fn}
@@ -117,8 +126,11 @@ func Run() {
 }
 
 func showHelp() {
-	fmt.Printf("%s (%s)\n\nUsage:\n  %s [command] [options]\n\nCommands:\n",
-		appName, appVersion, filepath.Base(os.Args[0]))
+	fmt.Printf("%s (%s)\n\n", appName, appVersion)
+	if appUsage != "" {
+		fmt.Printf("%s\n\n", appUsage)
+	}
+	fmt.Printf("Usage:\n  %s [command] [options]\n\nCommands:\n", filepath.Base(os.Args[0]))
 
 	var names []string
 	for cmdName := range commands {