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).

ytLive.csproj

@@ -29,13 +29,30 @@
       <BuildStampFile>$(IntermediateOutputPath)BuildStamp.g.cs</BuildStampFile>
       <BuildStampId>$([System.Guid]::NewGuid().ToString('N').Substring(0,8))</BuildStampId>
       <BuildStampTime>$([System.DateTime]::Now.ToString('yyyy-MM-dd HH:mm:ss'))</BuildStampTime>
+      <!-- RELEASE COUNTER (creator ruling 2026-09-04): the UI shows a sequential number that
+           ticks +1 per COMMIT, starting at 13 — a per-BUILD GUID changed on every launch and read
+           as noise (rightly). Derived from git rev-list count (stable per commit, no bookkeeping).
+           Baseline 241 = count at introduction, first display 13. Missing git or unparsed output
+           falls back to the start (build never breaks). GUID + compile time stay in startup.log,
+           where build-identity forensics actually live. -->
+      <BuildNumberBaseline>241</BuildNumberBaseline>
+      <BuildNumberStart>13</BuildNumberStart>
+    </PropertyGroup>
+    <Exec Command="&quot;C:\Program Files\Git\cmd\git.exe&quot; rev-list --count HEAD"
+          WorkingDirectory="$(ProjectDir)" ConsoleToMSBuild="true" IgnoreExitCode="true">
+      <Output TaskParameter="ConsoleOutput" PropertyName="CommitCountRaw" />
+    </Exec>
+    <PropertyGroup>
+      <CommitCount>$(CommitCountRaw.Trim())</CommitCount>
+      <BuildNumber>$([MSBuild]::Add($(BuildNumberStart), $([MSBuild]::Subtract($(CommitCount), $(BuildNumberBaseline)))))</BuildNumber>
+      <BuildNumber Condition="! $([System.Text.RegularExpressions.Regex]::IsMatch('$(BuildNumber)', '^[0-9]+$'))">$(BuildNumberStart)</BuildNumber>
     </PropertyGroup>
     <ItemGroup>
       <BuildStampLines Include="// &lt;auto-generated&gt; Per-build identity (ytLive.csproj GenerateBuildStamp)."/>
-      <BuildStampLines Include="// Shown as the wordmark superscript and logged at startup: proof of which"/>
-      <BuildStampLines Include="// binary produced a test recording (2026-09-04). Never edit by hand."/>
+      <BuildStampLines Include="// Release/Label = the sequential UI stamp (+1 per commit, started at 13)."/>
+      <BuildStampLines Include="// Id/BuiltLocal = per-build forensic identity, logged to startup.log only. Never edit by hand."/>
       <BuildStampLines Include="namespace ytLive.Helpers%3B"/>
-      <BuildStampLines Include="public static class BuildStamp { public const string Id = &quot;$(BuildStampId)&quot;%3B public const string BuiltLocal = &quot;$(BuildStampTime)&quot;%3B }"/>
+      <BuildStampLines Include="public static class BuildStamp { public const int Release = $(BuildNumber)%3B public const string Label = &quot;#$(BuildNumber)&quot;%3B public const string Id = &quot;$(BuildStampId)&quot;%3B public const string BuiltLocal = &quot;$(BuildStampTime)&quot;%3B }"/>
     </ItemGroup>
     <WriteLinesToFile File="$(BuildStampFile)" Lines="@(BuildStampLines)" Overwrite="true" WriteOnlyWhenDifferent="false" />
     <ItemGroup>