fix(ui): OP3 re-review residuals R1/R2/R3 (coordinator pass)

R1: the gate script no longer promises a timestamp prefix on the Magic
macro lines — acdream renders no chat timestamps yet (the Display
Timestamps consumer is OP4 scope; no chat-log file exists, TS-69). A
bare light-blue transcript line is the CORRECT gate outcome.

R2: IsGrounded yields null (silent) for a NULL controller in player
mode — the prior pattern returned false and fired the mid-air refusal
retail cannot produce in that state; comments now match the code.

R3: the dormant-ActivePageChanged pin now applies the real stimulus —
every authored tab button on a dormant host must carry NO click handler
(RetailTabBinding.SetClick never ran), which is AD-73's actual dormancy
mechanism; SwitchTo deliberately has no guard.

OP3 is CLOSED: dual APPROVE-WITH-FIXES -> fix round 386076af ->
re-review REOPEN(narrow) -> this pass. Connected gate now READY.

Full Release suite: 12,956 passed / 4 skipped / 0 failed.

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

tests/AcDream.App.Tests/UI/Layout/OP2ReworkBlastRadiusConformanceTests.cs

@@ -89,6 +89,22 @@ public class OP2ReworkBlastRadiusConformanceTests
         host.ActivePageChanged += (_, _) => raised++;
 
         Assert.False(host.BehaviorActive);
+
+        // R3 (OP3 re-review, 2026-08-11): a subscribe-then-assert-zero pin
+        // passes even with dormancy fully broken. The REAL dormancy
+        // mechanism is that ActivateTabBehavior (via RetailTabBinding.
+        // SetClick) was never called, so the authored tab BUTTONS carry no
+        // click handler — clicking a dormant host's tab can invoke nothing.
+        // SwitchTo itself deliberately has no dormancy guard (a controller
+        // may drive it directly), so the button wiring IS the contract.
+        foreach (UiTabTableEntry tab in host.Tabs)
+        {
+            var button = layout.FindElement(tab.ButtonElementId);
+            Assert.NotNull(button);
+            Assert.False(button!.HandlesClick,
+                $"dormant tab button 0x{tab.ButtonElementId:X8} has a click "
+                + "handler — import-time activation regressed (AD-73)");
+        }
         Assert.Equal(0, raised);
     }