Record the digest of the image that went out

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -8,7 +8,9 @@ not from the output of `docker push`.
 
 ---
 
-## Unreleased
+## 2026-08-11 — Margins and a stray placeholder
+
+**Images** — web `sha256:3a181ff3…`, server unchanged at `sha256:0832ee2b…`
 
 **Changed**
 - **Narrower margins on the sheet** — the column went from about 73 characters