Plex (R-1045): the controller asks Plex itself whether it is claimed — after the claim and on the household's „Kész”; no template probe (an older controller would refuse the press forever)

Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

controller/internal/web/media_events.go

@@ -385,7 +385,7 @@ func (s *Server) appPlexClaimHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	for i := 0; i < 10; i++ {
-		if has, done, _, perr := s.stackMgr.SetupGateProbe("plex"); has && perr == nil && done {
+		if plexClaimed() {
 			if oerr := s.stackMgr.OpenSetupGate("plex", stacks.SetupGateByProbe); oerr != nil && !errors.Is(oerr, stacks.ErrSetupGateNotClosed) {
 				s.logger.Printf("[WARN] [web] plex: claimed, but opening the setup gate failed: %v", oerr)
 			}
@@ -442,3 +442,25 @@ func ejectStep(sp settings.StoragePath, disks []agentapi.DiskInfo) (int, *agenta
 	}
 	return ejectBack, disk
 }
+
+// plexClaimed asks the running Plex itself whether it is claimed (`/identity`, JSON only with this Accept header —
+// measured 2026-10-15). A seam for tests. The live template carries NO setup_done_probe on purpose: a controller older
+// than 0.313.0 would send no Accept header, read XML as „not JSON" and refuse the household's „Kész" forever.
+var plexClaimed = func() bool {
+	req, err := http.NewRequest(http.MethodGet, "http://plex:32400/identity", nil)
+	if err != nil {
+		return false
+	}
+	req.Header.Set("Accept", "application/json")
+	resp, err := (&http.Client{Timeout: 5 * time.Second}).Do(req)
+	if err != nil {
+		return false
+	}
+	defer resp.Body.Close()
+	var id struct {
+		MediaContainer struct {
+			Claimed bool `json:"claimed"`
+		} `json:"MediaContainer"`
+	}
+	return resp.StatusCode == http.StatusOK && json.NewDecoder(resp.Body).Decode(&id) == nil && id.MediaContainer.Claimed
+}