refactor(audience-sample-app): drop log row count cap

Removes the LogCapacity const (200) and the eviction check inside
AppendLog. Log rows now accumulate until the user clicks Clear or
the session ends. Sample-app demo sessions are short and the cap
was preventive rather than corrective.

Author: ImmutableJeffrey

examples/audience/Assets/SampleApp/Scripts/AudienceSample.UI.cs

@@ -28,7 +28,6 @@ private static readonly (string TabId, string PanelId)[] Tabs =
 
         private static readonly string[] StateClasses = { "state-ok", "state-warn", "state-err", "dim" };
 
-        private const int LogCapacity = 200;
         private const int CollapseThreshold = 240;
         private const int StatusPollIntervalMs = 500;
         private const float NarrowBreakpointPx = 1024f;
@@ -698,9 +697,6 @@ private void AppendLog(string label, string? body, LogLevel level, LogSource sou
                 return;
             }
 
-            if (_logView.contentContainer.childCount >= LogCapacity)
-                _logView.contentContainer.RemoveAt(0);
-
             // Snapshot "was at bottom?" before adding — stateless per-row check.
             var s = _logView.verticalScroller;
             bool wasAtBottom = s.highValue <= 0 || (s.highValue - s.value) < 4f;