Changelog

0.1.0

• Initial release: GSTR-2B (JSON and Excel) vs purchase register reconciliation.
• GSTIN mod-36 checksum validation, invoice number normalisation.
• Five ordered matching passes including bounded subset-sum one-to-many.
• Section 17(5), RCM, section 16(4) and 180-day (section 16(2)) ITC checks.
• SQLite-backed carry forward of unmatched books invoices.
• Excel workbook, JSON, vendor follow-up drafts, explain command.