diff --git a/docs/plans/2026-05-28-opcua-tag-browser.md b/docs/plans/2026-05-28-opcua-tag-browser.md
index 32a69167..2975f1e0 100644
--- a/docs/plans/2026-05-28-opcua-tag-browser.md
+++ b/docs/plans/2026-05-28-opcua-tag-browser.md
@@ -1758,6 +1758,16 @@ git commit -m "feat(centralui): add OPC UA browse button + override column to In
 
 ### Task 19: End-to-end smoke (manual)
 
+> **PASS 2026-08-01 (online + offline)** — run live on the docker rig against a purpose-built
+> deployed instance (data-sourced Float attribute bound to site-a's "OPC PLC Simulator";
+> artifacts deleted after). Online: Browse dialog opened, root populated (Server visible),
+> expanded OpcPlc → Telemetry → Basic, selected `StepUp` — footer + override stored the durable
+> `nsu=http://microsoft.com/Opc/OpcPlc/;s=StepUp` form and it persisted across save + reload.
+> Offline: with BOTH site-a nodes stopped, Browse showed the error banner
+> (`StatusCode="Unavailable"` + Retry) with the manual-paste field still usable; a hand-typed
+> `ns=3;s=TestChildObject.TestInt` (bare-index advisory shown as designed) went Use → Select →
+> Save and persisted across reload while the site was down. Pair restarted staggered and rejoined.
+
 **Classification:** trivial
 **Estimated implement time:** ~5 min (manual)
 **Parallelizable with:** none (validates Tasks 1–18 together)