feat(file-summary): 实现文件处理技能链路

tests/test_file_summary_skills.py

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+import pytest
+
+from review_agent.file_summary.skills.base import BaseSkill, SkillResult, WorkflowContext
+from review_agent.file_summary.skills.registry import SkillRegistry
+
+
+class EchoSkill(BaseSkill):
+    name = "echo"
+
+    def run(self, context):
+        return SkillResult(success=True, data={"batch_id": context.batch.id})
+
+
+@pytest.mark.django_db
+def test_skill_registry_executes_registered_skill(django_user_model):
+    from review_agent.models import Conversation, FileSummaryBatch
+
+    user = django_user_model.objects.create_user(username="owner", password="pass")
+    conversation = Conversation.objects.create(user=user, title="会话")
+    batch = FileSummaryBatch.objects.create(conversation=conversation, user=user, batch_no="FS-X")
+    registry = SkillRegistry()
+    registry.register(EchoSkill())
+
+    result = registry.execute("echo", WorkflowContext(batch=batch))
+
+    assert result.success is True
+    assert result.data == {"batch_id": batch.id}