daily coverage-survey refresh

README.md

@@ -177,13 +177,32 @@ The same survey, as a page with the bar chart of the largest archives:
 [https://github.com/APVentureEngine/warn-act-notices](https://github.com/APVentureEngine/warn-act-notices).
 
 <!-- warn-feed:offer:start -->
-## Use it, or keep watching it
+## A layoff record you can audit, not just download
 
 This dataset is one cut of a single daily rebuild: **61,309 US WARN Act
 layoff notices from 48 state agencies, 1988 to today**, one schema, no
 login, no delay, CC BY 4.0. Snapshot as of **2026-09-14**; the files above are
 rebuilt every day, so the live count is the truth.
 
+Several projects publish a current WARN scrape and two of them carry more rows
+than we do. None of them publish what the records **used to say**:
+
+- **525 field-level changes, logged every day since 2026-08-31.**
+  `data/revisions.csv` records each time a state agency edited a notice after
+  publishing it — employee counts, effective dates, notice types, company names —
+  with the old value, the new value and the date we saw the change. A scrape that
+  starts tomorrow cannot backfill this; it only exists if someone was watching.
+- **6,799 notices whose state agency page no longer lists them.** Agencies
+  take notices down. We keep them, flagged as archive-only, so a count you ran
+  last year still reconciles.
+- **Point-in-time employer identity.** The ticker crosswalk resolves a filer to
+  the company as it existed at the time of the notice — Kmart, Sears Holdings,
+  Symantec — not to whatever is on today's ticker file.
+
+If you have to defend a number to an editor, a referee or a compliance reviewer,
+that provenance layer is the part you cannot rebuild yourself.
+[How to cite this dataset →](https://github.com/APVentureEngine/warn-act-notices/blob/main/CITATION.cff)
+
 **Look something up right now — free, no signup, nothing to install.**
 [Check any employer or state against the last 180 days
 →](https://approjects-warn-act-notices.static.hf.space/watch-now.html) It runs in your browser against these same files.
@@ -211,8 +230,3 @@ record, so an invoice can carry your company name.
 
 [Source, scrapers and methodology](https://github.com/APVentureEngine/warn-act-notices) · [the 48-state site](https://approjects-warn-act-notices.static.hf.space/)
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-
-<!-- warn-feed:px:start -->
-<img src="https://cdn.jsdelivr.net/gh/APVentureEngine/warn-act-notices@main/assets/px/hf/which-us-states-publish-warn-act-layoff-notices-coverage.png" width="1" height="1" alt="">
-<sub>Card views are counted anonymously: one 1×1 image on a public CDN, no cookies, no script, no personal data. The count is public: <a href="https://data.jsdelivr.com/v1/stats/packages/gh/APVentureEngine/warn-act-notices@main/files?period=month">jsDelivr stats</a>.</sub>
-<!-- warn-feed:px:end -->