v0.7.0

[0.7.0] - 2025-12-24

🚀 New Features

Workbook Metadata Support

Added metadata field to the Workbook model, allowing arbitrary data storage at the workbook level. This aligns the Workbook model with Sheet and Table models.

wb = Workbook(sheets=[], metadata={"author": "Alice"})
# Metadata is persisted at the end of the file:
# <!-- md-spreadsheet-workbook-metadata: {"author": "Alice"} -->

🐛 Bug Fixes

Excel Parsing Improvements

• Fix: Improved hierarchical header flattening for vertically merged cells (e.g., prohibiting trailing separators like Status - ).
• Enhancement: Cleaner string conversion for Excel numbers; integer-floats (e.g., 1.0) are now automatically converted to valid integers ("1") instead of preserving the decimal ("1.0").