The judge check gives each judgment a text of its own

The same text again was answered from what the engine kept of the last
reading, in a tenth of the time: the check read 4.9 s, then 0.5 and 0.5.
Each judgment now begins with a line of its own.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/control/adminapi/judges.go

@@ -275,8 +275,20 @@ func (a *API) checkJudge(w http.ResponseWriter, r *http.Request) {
 		v.Burst = 2 * jv.Ready
 	}
 	v.Burst = min(v.Burst, 32)
+	var mu sync.Mutex
+	start := time.Now()
+	// Each text begins differently: the engine keeps what it read before,
+	// and the same text again is answered from that in a tenth of the time
+	// a request's own prompt takes.
+	n := 0
+	text := func() string {
+		mu.Lock()
+		defer mu.Unlock()
+		n++
+		return fmt.Sprintf("Request %d of a check begun at %s.\n", n, start.Format(time.RFC3339Nano)) + judgeCheckText
+	}
 	for range 3 {
-		ans, err := a.guard.Ask(r.Context(), jv.Model, judgeCheckText, "")
+		ans, err := a.guard.Ask(r.Context(), jv.Model, text(), "")
 		if err != nil {
 			writeError(w, http.StatusBadGateway, fmt.Sprintf("the judge %s gave no verdict: %v", jv.Model, err))
 			return
@@ -284,14 +296,13 @@ func (a *API) checkJudge(w http.ResponseWriter, r *http.Request) {
 		v.TookMs = append(v.TookMs, ans.Took.Milliseconds())
 		v.SlowestMs = max(v.SlowestMs, ans.Took.Milliseconds())
 	}
-	var mu sync.Mutex
 	var wg sync.WaitGroup
-	start := time.Now()
+	start = time.Now()
 	for range v.Burst {
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
-			ans, err := a.guard.Ask(r.Context(), jv.Model, judgeCheckText, "")
+			ans, err := a.guard.Ask(r.Context(), jv.Model, text(), "")
 			mu.Lock()
 			defer mu.Unlock()
 			if err != nil {