Sync canonical offer/contact block (hf_cards_sync)

README.md

@@ -222,6 +222,11 @@ that provenance layer is the part you cannot rebuild yourself.
 CSV, no key, no signup, `access-control-allow-origin: *` so `fetch()` works from
 a browser: [endpoints, schema and curl examples →](https://approjects-warn-act-notices.static.hf.space/api.html)
 
+**Prefer a spreadsheet?** One formula puts the last 90 days, the last 12 months
+or any single state into Google Sheets as a live range that refreshes itself —
+no signup, no add-on: [the formulas, one per state →](https://approjects-warn-act-notices.static.hf.space/sheets.html)
+`=IMPORTDATA("https://cdn.jsdelivr.net/gh/APVentureEngine/warn-act-notices@main/data/sheets/us-last-90-days.csv")`
+
 **Backtesting, or citing a figure you published last month?** Today's file has
 look-ahead and survivorship bias baked in: notices get amended after the fact and
 some rows are later deleted. The same table as it stood on any past day since