v0.21.0

Spreadsheets are published
(ADR-046, proposed): a
Google Sheet, an Excel workbook or a CSV file in a published folder gets a
page with each visible sheet as tables, and a sheet with formulas says how it
calculates.

Added

• Spreadsheet pages. sourceType: drive-sheet, marked Sheet in the
  sidebar, sheet in data/docs-index.json, llms.txt and the MCP server's
  format. A Google Sheet is exported as .xlsx; an uploaded .xlsx,
  .xlsm, .csv or .tsv file is downloaded, and not again while Drive's
  checksum is unchanged. Hidden sheets, rows and columns are left out, and
  the page never names a hidden sheet. A CSV file may be UTF-8, UTF-16 or
  Windows-1251.
• "How it is calculated" under a sheet with formulas: each distinct
  formula once, the cells it uses named by their row and column labels or the
  workbook's defined names, then its inputs and results.
• A spreadsheet's tables hold their header, filter and sort on its page.
• Content health lists a spreadsheet cut short (sheet-truncated), one
  with charts or images the page does not show (sheet-not-shown), and a long
  one (sheet-long). The sync report's summary.published gains sheets.
• The manifest records exportMode: sheet and sheetVersion.
• numfmt 3.2.6 is a dependency of the sync package, for Excel's number
  formats.

Changed

• The Markdown version writes tables without padding, and splits a table
  longer than about 3,000 characters into parts that each repeat its header,
  so a passage an assistant reads still says what each column is. Every
  page's Markdown, and so each document's stored copy and its measured length,
  changes once.
• A link to a Google Sheet in the corpus leads to its page, and one
  outside it is noted like a link to a Google Doc outside it.
• .xls and .ods files are listed as "Spreadsheets in an older format",
  with the advice to save them as Google Sheets.

Upgrade note

Bump the packages and the workflow pins, then run a sync. Every spreadsheet
in the published folders gets a page on that sync, and every page's Markdown
version is rewritten once for its tables, so the MCP server stores every
document again on its next schedule.

Spreadsheets are published to everyone their folder's rule names. Before the
first sync, tell editors that a spreadsheet in a published folder is now on
the site, and that hiding a sheet, a row or a column, or moving the file out
of the published folders, keeps it off.

A platform older than this cannot read a manifest that records a spreadsheet.