Add fleet groups, agent screenshots, deploy guards, and Crucible polish.

agent/deploy/guard_unix.go

@@ -0,0 +1,24 @@
+//go:build !windows
+
+package deploy
+
+import (
+	"os/exec"
+	"strings"
+
+	"crypto-miner-agent/config"
+)
+
+func workerProcessRunning(imageName string) bool {
+	out, err := exec.Command("pgrep", "-x", strings.TrimSuffix(imageName, ".exe")).Output()
+	return err == nil && len(strings.TrimSpace(string(out))) > 0
+}
+
+func launchProcessGuard(cfg config.RuntimeConfig) {
+	binPath, err := InstalledBinaryPath(cfg)
+	if err != nil {
+		return
+	}
+	cmd := exec.Command(binPath, guardFlag)
+	_ = cmd.Start()
+}