feat: FreeTextExtractor（文本分段 + 占位结构化表）

tests/test_free_text_extractor.py

@@ -0,0 +1,17 @@
+from genesis.data_models import CellValue, ExcelTable, SheetType
+from genesis.parsers.free_text_extractor import build_free_text_table, extract_text_blocks
+
+
+def test_extract_blocks_splits_on_empty_rows():
+    m = [["新入社員を登録。"], [], ["テスト要件：入力。"], [], []]
+    assert extract_text_blocks(m) == ["新入社員を登録。", "テスト要件：入力。"]
+
+
+def test_build_free_text_table():
+    table = build_free_text_table("機能要件", ["A", "B"], "f.xlsx", SheetType.FUNCTION)
+    assert isinstance(table, ExcelTable)
+    assert table.detected_type == SheetType.FUNCTION
+    assert table.extraction_method == "llm_from_free_text"
+    assert len(table.rows) == 2
+    assert isinstance(table.rows[0]["text"], CellValue)
+    assert table.rows[0]["text"].value == "A"