feat: MergeHandler + TableExtractor（forward_fill / 表格提取）

src/genesis/parsers/merge_fill.py

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+from __future__ import annotations
+
+from typing import Any
+
+
+def forward_fill(
+    matrix: list[list[Any]],
+    merged_ranges: list[tuple[int, int, int, int]],
+) -> list[list[Any]]:
+    """合并单元格：用左上角主格值填充范围内全部单元格。"""
+    out = [list(row) for row in matrix]
+    for (min_row, min_col, max_row, max_col) in merged_ranges:
+        if not out or min_row > len(out) or min_col > len(out[min_row - 1]):
+            continue
+        main_value = out[min_row - 1][min_col - 1]
+        for r in range(min_row, min(max_row, len(out)) + 1):
+            row = out[r - 1]
+            for c in range(min_col, min(max_col, len(row)) + 1):
+                row[c - 1] = main_value
+    return out

src/genesis/parsers/table_extractor.py

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+from __future__ import annotations
+
+from typing import Any
+
+from genesis.data_models import CellValue, ExcelTable, Provenance, SheetType
+
+
+def column_letter(index: int) -> str:
+    """1 → A、27 → AA。"""
+    letters = ""
+    while index > 0:
+        index, rem = divmod(index - 1, 26)
+        letters = chr(65 + rem) + letters
+    return letters
+
+
+def extract_table(
+    sheet_name: str,
+    matrix: list[list[Any]],
+    file_name: str,
+    detected_type: SheetType,
+    header_row: int = 0,
+) -> ExcelTable:
+    """从矩阵提取表格：首行视为表头，其后为数据行。"""
+    if not matrix:
+        return ExcelTable(
+            name=sheet_name, detected_type=detected_type,
+            extraction_method="openpyxl", headers=[], rows=[],
+        )
+    headers = [str(c) if c is not None else "" for c in matrix[header_row]]
+    rows = []
+    for r in range(header_row + 1, len(matrix)):
+        row_dict = {}
+        for c, h in enumerate(headers):
+            raw = matrix[r][c] if c < len(matrix[r]) else None
+            row_dict[h] = CellValue(
+                value=raw,
+                provenance=Provenance(
+                    file_name=file_name,
+                    sheet_name=sheet_name,
+                    row=r - header_row,   # 数据行号从 1 开始
+                    column=column_letter(c + 1),
+                    column_header=h,
+                ),
+            )
+        rows.append(row_dict)
+    return ExcelTable(
+        name=sheet_name, detected_type=detected_type,
+        extraction_method="openpyxl", headers=headers, rows=rows,
+    )

tests/test_table_extractor.py

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+from genesis.data_models import CellValue, ExcelTable, SheetType
+from genesis.parsers.merge_fill import forward_fill
+from genesis.parsers.table_extractor import column_letter, extract_table
+
+
+def test_forward_fill_vertical():
+    matrix = [
+        ["機能ID", "機能名", "備考"],
+        ["A001", "", ""],
+        ["", "", "メモ"],
+    ]
+    filled = forward_fill(matrix, [(1, 2, 2, 2)])  # B1:B2 纵向合并
+    assert filled[1][1] == "機能名"
+    assert filled[2][2] == "メモ"
+
+
+def test_forward_fill_horizontal():
+    matrix = [["A", "B"], ["x", ""]]
+    filled = forward_fill(matrix, [(2, 1, 2, 2)])  # A2:B2 横向合并
+    assert filled[1][1] == "x"
+    assert filled[1][0] == "x"
+
+
+def test_column_letter():
+    assert column_letter(1) == "A"
+    assert column_letter(27) == "AA"
+
+
+def test_extract_table_basic():
+    matrix = [["ID", "名前"], ["1", "田中"], ["2", "佐藤"]]
+    table = extract_table("社員一覧", matrix, "f.xlsx", SheetType.FUNCTION)
+    assert isinstance(table, ExcelTable)
+    assert table.headers == ["ID", "名前"]
+    assert table.extraction_method == "openpyxl"
+    assert len(table.rows) == 2
+    first = table.rows[0]
+    assert isinstance(first["ID"], CellValue)
+    assert first["ID"].value == "1"
+    assert first["ID"].provenance.sheet_name == "社員一覧"
+    assert first["ID"].provenance.column == "A"