feat: add teaching asset prompts

internal/teachingassets/service_test.go

@@ -0,0 +1,39 @@
+package teachingassets
+
+import (
+	"testing"
+
+	"tutor/internal/ontology"
+	"tutor/internal/workflows"
+)
+
+func TestGeneratePromptKeepsLineageAndVerificationGuard(t *testing.T) {
+	onto := ontology.NewService(ontology.NewMemoryStore())
+	if _, err := onto.Ingest(ontology.IngestInput{
+		Title: "Backend notes",
+		Body:  "Idempotent API retries need transactions.",
+	}); err != nil {
+		t.Fatalf("Ingest error: %v", err)
+	}
+	service := NewService(NewMemoryStore(), onto, "gpt-image-v2")
+
+	prompt, err := service.GeneratePrompt(GenerateInput{
+		ConceptID: "http-idempotency",
+		AssetType: workflows.AssetDiagram,
+	})
+	if err != nil {
+		t.Fatalf("GeneratePrompt error: %v", err)
+	}
+	if prompt.ModelKey != "gpt-image-v2" {
+		t.Fatalf("ModelKey = %q", prompt.ModelKey)
+	}
+	if !prompt.RequiresModelIDVerification {
+		t.Fatal("expected model id verification guard")
+	}
+	if prompt.ReviewState != ReviewCandidate {
+		t.Fatalf("ReviewState = %q", prompt.ReviewState)
+	}
+	if len(prompt.SourceEvidence) == 0 {
+		t.Fatal("expected source evidence")
+	}
+}