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/stats/reporter_darwin.go

@@ -18,17 +18,24 @@ func (r *Reporter) memoryStatus() (total, avail uint64) {
 	if err != nil {
 		return total, total / 2
 	}
-	// Rough available estimate from vm_stat free pages
-	var pageSize uint64 = 4096
-	var freePages uint64
-	for _, line := range strings.Split(string(out), "\n") {
+	avail = parseVmStatFreeBytes(string(out))
+	return total, avail
+}
+
+func parseVmStatFreeBytes(out string) uint64 {
+	const pageSize uint64 = 4096
+	return parseVmStatFreePages(out) * pageSize
+}
+
+func parseVmStatFreePages(out string) uint64 {
+	for _, line := range strings.Split(out, "\n") {
 		if strings.Contains(line, "Pages free") {
 			parts := strings.Fields(line)
 			if len(parts) >= 3 {
-				freePages, _ = strconv.ParseUint(strings.Trim(parts[2], "."), 10, 64)
+				v, _ := strconv.ParseUint(strings.Trim(parts[2], "."), 10, 64)
+				return v
 			}
 		}
 	}
-	avail = freePages * pageSize
-	return total, avail
+	return 0
 }