feat(file-summary): 实现文件处理技能链路

tests/test_file_summary_archive.py

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+from zipfile import ZipFile
+import pytest
+
+from review_agent.file_summary.services.archive import extract_archive
+
+
+def test_extract_zip_preserves_safe_paths(tmp_path):
+    archive_path = tmp_path / "safe.zip"
+    with ZipFile(archive_path, "w") as archive:
+        archive.writestr("dir/a.txt", "content")
+
+    target = tmp_path / "out"
+    extracted = extract_archive(archive_path, target)
+
+    assert extracted == [target / "dir" / "a.txt"]
+    assert (target / "dir" / "a.txt").read_text(encoding="utf-8") == "content"
+
+
+def test_extract_zip_rejects_path_traversal(tmp_path):
+    archive_path = tmp_path / "evil.zip"
+    with ZipFile(archive_path, "w") as archive:
+        archive.writestr("../evil.txt", "bad")
+
+    with pytest.raises(ValueError):
+        extract_archive(archive_path, tmp_path / "out")