diff --git a/CHANGELOG.md b/CHANGELOG.md
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--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,8 @@
 
 ## [Unreleased]
 
+## [v0.51.591] — 2026-06-22 — Release UX (stop transcript jumping to first message on completion)
+
 ### Fixed
 
 - **The transcript no longer jumps to the first message after every completion.** On a long conversation that loaded truncated, finishing a turn snapped the viewport to the top. The `done` event replaced the transcript with the full payload and expanded the render window to all messages, but left `_oldestIdx` stale — so the absolute scroll anchor (introduced with the read-position work) resolved to the wrong row and the view jumped to the start. The completion handler now resets `_oldestIdx` from the payload exactly like the other full-load paths, keeping the reader anchored where they were. Pinned-at-bottom readers still follow to the latest message. (#4720)