Wire drift judge into the daemon alongside the coach

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

cmd/antidriftd/main.go

@@ -36,10 +36,12 @@ func main() {
 	// (claude default, or codex). Misconfiguration degrades to no coach rather
 	// than failing startup — manual planning still works.
 	if backend, err := ai.NewBackend(os.Getenv("ANTIDRIFT_AI_BACKEND")); err != nil {
-		log.Printf("ai coach disabled: %v", err)
+		log.Printf("ai disabled: %v", err)
 	} else {
-		ctrl.SetCoach(ai.NewService(backend))
-		log.Printf("ai coach: %s backend", backend.Name())
+		svc := ai.NewService(backend)
+		ctrl.SetCoach(svc)
+		ctrl.SetDriftJudge(svc)
+		log.Printf("ai: %s backend (coach + drift judge)", backend.Name())
 	}
 
 	src := evidence.NewSource()