feat: add natural elder story companion flow

internal/extraction/processor_safety_test.go

@@ -2,6 +2,7 @@ package extraction
 
 import (
 	"context"
+	"strings"
 	"testing"
 
 	"data-terminal-cloud/internal/contentpolicy"
@@ -41,3 +42,17 @@ func TestGenerateSafelyBlocksModelOutputBeforePersistence(t *testing.T) {
 		t.Fatalf("result=%+v generator_calls=%d classifier_calls=%d", result, generator.calls, classifier.calls)
 	}
 }
+
+func TestJoinedSubjectContentCannotPromoteAgentClaims(t *testing.T) {
+	content := joinedSubjectContent([]turn{
+		{speaker: "agent", text: "您年轻时一定在铁路上工作过。"},
+		{speaker: "subject", text: "没有，我以前在学校教书。"},
+		{speaker: "agent", text: "那您一定教了四十年。"},
+	})
+	if strings.Contains(content, "铁路") || strings.Contains(content, "四十年") {
+		t.Fatalf("agent claims entered extraction content: %q", content)
+	}
+	if content != "长者：没有，我以前在学校教书。" {
+		t.Fatalf("subject extraction content=%q", content)
+	}
+}