refresh card (through block-8913600)

README.md

@@ -41,10 +41,10 @@ scheme: they were **rebuilds**, not byte mirrors, and are known to differ from
 the scored tars (see the repo issue history). Use the `-block-<N>` folders for
 exact replay.
 
-## Latest revealed — `2026-08-20` (block 8884800)
+## Latest revealed — `2026-08-24` (block 8913600)
 
-- **series:** 2380
-- **sha256:** `5d32b460a40e52dcfec8470ac070797892da8eacaac00191b6ee9b89eabd4e27`
+- **series:** 2407
+- **sha256:** `095867db4a3f05197f3b601417a9dc83bcbe90a07ebea7e343ff2455510a6314`
 
 > This is an **evaluation** set, not training data. Publishing it to train on
 > would contaminate the benchmark it exists to measure.