Media build part 2 (unreleased): drive wiring in every app (R-1024/R-1037), old-install repair (R-1047), drive events notice + real restart now/later + stream check, file browser lets go of dead/removed drives and recreates on return (R-1038), safe removal keeps the drive (R-1044), Plex claim on the running server + probe accept (R-1028/R-1045)

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

controller/internal/stacks/setup_gate_accept_test.go

@@ -0,0 +1,42 @@
+package stacks
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+// R-1028/R-1045: Plex's „claimed" can be probed only with Accept: application/json (it answers XML otherwise —
+// measured 2026-10-15 on Tester 1). The probe with `accept:` reads the JSON field; without it the same server reads
+// „not JSON" and the gate stays closed. COMPANION RED-PROOF: ignore p.Accept in probeOnce → the first case fails.
+func TestSetupDoneProbe_AcceptJSON_Plex(t *testing.T) {
+	claimed := false
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		c := "0"
+		if claimed {
+			c = "1"
+		}
+		if r.Header.Get("Accept") == "application/json" {
+			v := "false"
+			if claimed {
+				v = "true"
+			}
+			_, _ = w.Write([]byte(`{"MediaContainer":{"size":0,"claimed":` + v + `}}`))
+			return
+		}
+		_, _ = w.Write([]byte(`<?xml version="1.0"?><MediaContainer size="0" claimed="` + c + `"></MediaContainer>`))
+	}))
+	defer srv.Close()
+	p := &SetupDoneProbe{URL: srv.URL + "/identity", Field: "MediaContainer.claimed", Done: "true", Accept: "application/json"}
+	if done, got, err := probeOnce(p); err != nil || done {
+		t.Fatalf("an unclaimed Plex must read NOT done: done=%v got=%q err=%v", done, got, err)
+	}
+	claimed = true
+	if done, got, err := probeOnce(p); err != nil || !done {
+		t.Fatalf("a claimed Plex must read done: done=%v got=%q err=%v", done, got, err)
+	}
+	p.Accept = ""
+	if done, got, _ := probeOnce(p); done || got != "not JSON" {
+		t.Fatalf("without the Accept header Plex answers XML: done=%v got=%q", done, got)
+	}
+}