Portability: sysfs-only sensors with thermal-zone fallback, /sys/block disk discovery, fs blacklist, pwrstat/NUT/apcupsd UPS, login shell from passwd, templated unit + install for any user, cross-compile targets

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

internal/api/server.go

@@ -10,6 +10,7 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"os/user"
 	"strings"
 	"time"
 
@@ -41,8 +42,11 @@ func New(cfg *config.Config, sessions *auth.Sessions, mgr *term.Manager, col *me
 	host, _ := os.Hostname()
 	s := &Server{cfg: cfg, sessions: sessions, mgr: mgr, metrics: col, ui: ui, version: version,
 		started: time.Now(), host: host, user: os.Getenv("USER")}
+	if u, err := user.Current(); err == nil && u.Username != "" {
+		s.user = u.Username
+	}
 	if s.user == "" {
-		s.user = "core"
+		s.user = "?"
 	}
 	m := http.NewServeMux()
 	m.HandleFunc("GET /healthz", func(w http.ResponseWriter, _ *http.Request) { w.WriteHeader(204) })