feat(ux)+fix(rings): release counter #N in the wordmark; all shared-frame rings 4->8 (#11)

Roll-forward of today-slices 6fd1d9c onto the slice-8 base, two-loop hunk dropped.

Release counter (per-build GUID read as noise; +1 per commit from git rev-list,
baseline 241 -> #13, generated by GenerateBuildStamp; GUID demotes to startup.log).
Tests pinned to Label/#N >= 13; wordmark display test asserts the Label.

Flash fix (take 14 finding): consumer holds must never outlive depth x source
period — 4 slots at high refresh lap ~27ms vs a <=50ms compositor read, so a
recycled slot flashed its new frame over the lagged old one. All shared rings 4->8
(OBS/overlay precedent for ring discipline).

Camera producer now rotates an 8-deep ring + Epoch instead of a fresh ~3.7MB
array per device frame (110-220MB/s LOH churn); WebView2 capture reuses a canvas
scratch + 8-deep output ring + a reused WriteableBitmap instead of two fresh
arrays + a fresh bitmap per 10Hz tick. Paste cache stays identity-keyed (Epoch).

Controls/TopBar.xaml

@@ -22,9 +22,9 @@
             </Button.Template>
             <TextBlock FontSize="22" FontWeight="Bold">
                 <Run Text="LlamaCas" Foreground="#e0e0e0"/><Run Text="ty" Foreground="#e94560"/><Run
-                    x:Name="BuildIdStamp" Text="{x:Static helpers:BuildStamp.Id}" FontSize="9"
+                    x:Name="BuildIdStamp" Text="{x:Static helpers:BuildStamp.Label}" FontSize="9"
                     BaselineAlignment="Superscript" Foreground="#8888aa"
-                    ToolTipService.ToolTip="{x:Static helpers:BuildStamp.Id}"/><Run Text=" " FontSize="4"/>
+                    ToolTipService.ToolTip="{x:Static helpers:BuildStamp.Label}"/><Run Text=" " FontSize="4"/>
             </TextBlock>
         </Button>