feat: ExcelParser 编排器（类型/性质/提取/汇总）

tests/test_excel_parser.py

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+from genesis.data_models import SheetType
+from genesis.parsers.excel_parser import ExcelParseResult, ExcelParser
+
+from tests.excel_helpers import new_workbook, save_workbook
+
+
+def test_parse_table_sheets(tmp_path):
+    wb = new_workbook({
+        "機能一覧": [["機能ID", "機能名"], ["A001", "社員登録"]],
+        "バッチ一覧": [["バッチID", "処理名"], ["B1", "夜間集計"]],
+    })
+    path = save_workbook(tmp_path, wb)
+    result = ExcelParser().parse(path)
+    assert isinstance(result, ExcelParseResult)
+    by_name = {t.name: t for t in result.tables}
+    assert by_name["機能一覧"].detected_type == SheetType.FUNCTION
+    assert len(by_name["機能一覧"].rows) == 1
+    assert by_name["バッチ一覧"].detected_type == SheetType.BATCH
+
+
+def test_parse_free_text_sheet(tmp_path):
+    wb = new_workbook({"メモ": [["新入社員を登録"], [], [], [], []]})
+    path = save_workbook(tmp_path, wb)
+    result = ExcelParser().parse(path)
+    assert len(result.tables) == 1
+    assert result.tables[0].extraction_method == "llm_from_free_text"