diff --git a/persistent-memory.md b/persistent-memory.md
index e7061e3..efddfc5 100644
--- a/persistent-memory.md
+++ b/persistent-memory.md
@@ -84,7 +84,8 @@ _As of 2026-09-23:_
   number:** `tests/test_thumbs_browser.py` holds it against the rendered grid,
   so if a redesign widens the tiles, that test goes red. The 2-column (≤472px)
   and 1-column (≤650px) reflows are softer than 768 covers at 2x; 1024 would
-  cover 2 columns for 18.5 MB total. Four surfaces (tile, Desk strip, flag tray,
+  cover 2 columns for 18.5 MB total. **Operator kept 768 (2026-09-24)**; do not
+  re-raise it. Four surfaces (tile, Desk strip, flag tray,
   filmstrip); the review stage keeps the original. The heid bug-hunt (4/4
   arms) folded: a cache hit must be a regular file carrying its source's EXACT
   mtime (a planted directory, or a `cp -p` older source, no longer pins a