fix(api): autodetect unified vs multi-process status for running field

handlers + poller llamaban Manager.StatusAll() siempre. En unified mode (launcher
arranca todos los agents como goroutines bajo 1 PID) no existen PID files
por agente, asi que StatusAll devolvia Running=false aunque los agents estaban
operativos.

Anade Server.statusAllAuto() que chequea IsUnifiedRunning() y delega a
StatusAllUnified() o StatusAll() segun corresponda. Reemplaza las 3 llamadas
directas en handlers.go (handleListAgents, handleGetAgent) y poller.go
(pollStatus seed + checkAndPublishDiffs).

Sin esto el frontend (0129) mostraria running=false universal.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/api/handlers.go

@@ -51,10 +51,21 @@ func (s *Server) handleHealth(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, map[string]string{"status": "ok", "time": time.Now().UTC().Format(time.RFC3339)})
 }
 
+// statusAllAuto chooses unified vs multi-process status based on runtime mode.
+// In unified mode all agents run as goroutines under one launcher process — per-agent
+// PID files do not exist, so StatusAll reports Running=false. StatusAllUnified
+// reflects the real state.
+func (s *Server) statusAllAuto() ([]process.AgentStatus, error) {
+	if s.mgr.IsUnifiedRunning() {
+		return s.mgr.StatusAllUnified()
+	}
+	return s.mgr.StatusAll()
+}
+
 // --- List agents ---
 
 func (s *Server) handleListAgents(w http.ResponseWriter, r *http.Request) {
-	statuses, err := s.mgr.StatusAll()
+	statuses, err := s.statusAllAuto()
 	if err != nil {
 		writeError(w, http.StatusInternalServerError, fmt.Sprintf("scan: %v", err))
 		return
@@ -70,7 +81,7 @@ func (s *Server) handleListAgents(w http.ResponseWriter, r *http.Request) {
 
 func (s *Server) handleGetAgent(w http.ResponseWriter, r *http.Request) {
 	id := r.PathValue("id")
-	statuses, err := s.mgr.StatusAll()
+	statuses, err := s.statusAllAuto()
 	if err != nil {
 		writeError(w, http.StatusInternalServerError, fmt.Sprintf("scan: %v", err))
 		return

internal/api/poller.go

@@ -22,7 +22,7 @@ func (s *Server) pollStatus(ctx context.Context) {
 
 	// Seed the previous state map.
 	prev := make(map[string]bool)
-	if statuses, err := s.mgr.StatusAll(); err == nil {
+	if statuses, err := s.statusAllAuto(); err == nil {
 		for _, st := range statuses {
 			prev[st.ID] = st.Running
 		}
@@ -39,7 +39,7 @@ func (s *Server) pollStatus(ctx context.Context) {
 }
 
 func (s *Server) checkAndPublishDiffs(prev map[string]bool) {
-	statuses, err := s.mgr.StatusAll()
+	statuses, err := s.statusAllAuto()
 	if err != nil {
 		return
 	}