feat: multi-profile system with Francesca and Sebastian curricula

- Add Profile enum (ISABELLA, FRANCESCA, SEBASTIAN) to Child model
- Add ?profile= query param override to /api/curriculum/next
- Pass profile prop from profile-specific pages to ExerciseSession
- Fix curriculum import paths (engine uses @/curriculum/ alias)
- Clear stale curriculumCache on dev reload
- Fix self-referential prerequisites in Francesca etapa-1
- Fix prerequisite chains in Francesca etapa-2,3,4 and Sebastian etapa-2,3
- Add Francesca curriculum: 2-3 digit sums, subtractions, multiplications, short readings
- Add Sebastian curriculum: 2-3 digit sums, interactive exercises, Argentine history, flags
- All 44 E2E tests pass, TypeScript compiles cleanly

app/francesca/lecturas/page.tsx

@@ -0,0 +1,12 @@
+import ExerciseSession from "@/components/child/exercise-session"
+
+export default function FrancescaLecturas() {
+  return (
+    <ExerciseSession
+      topic="lecturas"
+      profile="FRANCESCA"
+      loadingMessage="Preparando lecturas..."
+      completeMessage="¡Terminaste las lecturas por ahora!"
+    />
+  )
+}

app/francesca/matematicas/page.tsx

@@ -0,0 +1,12 @@
+import ExerciseSession from "@/components/child/exercise-session"
+
+export default function FrancescaMate() {
+  return (
+    <ExerciseSession
+      topic="matematicas"
+      profile="FRANCESCA"
+      loadingMessage="Preparando matemáticas..."
+      completeMessage="¡Terminaste las matemáticas por ahora!"
+    />
+  )
+}

app/francesca/page.tsx

@@ -0,0 +1,65 @@
+"use client"
+
+import { useEffect, useState } from "react"
+import { useRouter } from "next/navigation"
+import { GatoMascota } from "@/components/child/gato-mascota"
+import AudioUnlock from "@/components/child/audio-unlock"
+
+const FRANCESCA_KEY = "edueasy_child_francesca"
+
+const activities = [
+  { id: "matematicas", label: "Matemáticas", icon: "🔢", description: "Sumas, restas y multiplicaciones" },
+  { id: "lecturas", label: "Lecturas cortas", icon: "📖", description: "Leé textos chiquitos" },
+  { id: "logros", label: "Mis logros", icon: "⭐", color: "bg-warning" },
+  { id: "pairing", label: "iPad nuevo", icon: "🔗", color: "bg-secondary" },
+]
+
+export default function FrancescaHome() {
+  const router = useRouter()
+  const [audioReady, setAudioReady] = useState(false)
+  const [paired, setPaired] = useState(false)
+
+  useEffect(() => {
+    setPaired(!!localStorage.getItem(FRANCESCA_KEY))
+  }, [])
+
+  if (!audioReady) {
+    return <AudioUnlock onUnlock={() => setAudioReady(true)} />
+  }
+
+  return (
+    <div className="flex-1 flex flex-col items-center justify-center p-6 gap-8">
+      <GatoMascota mood="happy" message="¡Hola Francesca! ¿Qué querés practicar hoy?" />
+
+      {!paired ? (
+        <div className="text-center max-w-xs space-y-4">
+          <p className="text-foreground/60">Todavía no estás conectada. Pedile a mamá que te empareje.</p>
+          <button
+            onClick={() => router.push("/child/pairing?profile=francesca")}
+            className="bg-primary text-primary-foreground touch-target-lg rounded-2xl px-8 py-4 text-xl font-display font-bold"
+          >
+            Ir a emparejar
+          </button>
+        </div>
+      ) : (
+        <div className="flex flex-col gap-4 w-full max-w-md">
+          {activities.map((a) => (
+            <button
+              key={a.id}
+              onClick={() => router.push(`/francesca/${a.id}`)}
+              className={`${a.color || "bg-accent"} text-primary-foreground touch-target-lg rounded-2xl flex items-center gap-4 px-6 py-5 text-xl font-display font-semibold shadow-md active:scale-95 transition-transform`}
+            >
+              <span className="text-2xl">{a.icon}</span>
+              <div className="text-left">
+                <div>{a.label}</div>
+                {a.description && (
+                  <div className="text-sm opacity-80">{a.description}</div>
+                )}
+              </div>
+            </button>
+          ))}
+        </div>
+      )}
+    </div>
+  )
+}