feat(file-summary): 接入文件汇总工作流触发

tests/test_file_summary_trigger.py

@@ -0,0 +1,32 @@
+import pytest
+
+from review_agent.file_summary.workflow_trigger import evaluate_file_summary_trigger
+from review_agent.models import Conversation, FileAttachment
+
+
+pytestmark = pytest.mark.django_db
+
+
+def test_trigger_matches_keywords_only_when_active_attachment_exists(django_user_model):
+    user = django_user_model.objects.create_user(username="owner", password="pass")
+    conversation = Conversation.objects.create(user=user, title="会话")
+
+    no_file = evaluate_file_summary_trigger(conversation, "请自动汇总文件目录与页数")
+    assert no_file.should_start is False
+    assert no_file.reason == "missing_attachment"
+
+    FileAttachment.objects.create(
+        conversation=conversation,
+        user=user,
+        original_name="a.docx",
+        storage_path="x/a.docx",
+        file_size=1,
+    )
+
+    matched = evaluate_file_summary_trigger(conversation, "请自动汇总文件目录与页数")
+    assert matched.should_start is True
+    assert matched.workflow_type == "file_summary"
+
+    normal = evaluate_file_summary_trigger(conversation, "你好，帮我解释法规")
+    assert normal.should_start is False
+    assert normal.reason == "not_matched"