fix(diag): identify the binary measured by soak reports

tests/AcDream.App.Tests/Diagnostics/ConnectedR6SoakContractTests.cs

@@ -289,6 +289,35 @@ public sealed class ConnectedR6SoakContractTests
         Assert.Contains("$env:ACDREAM_DUMP_MOVE_TRUTH = '1'", source, StringComparison.Ordinal);
     }
 
+    [Fact]
+    public void BaselineIdentityComesFromTheMeasuredBinaryRatherThanOnlyTheCheckout()
+    {
+        string source = File.ReadAllText(Path.Combine(
+            FindRepoRoot(),
+            "tools",
+            "run-connected-r6-soak.ps1"));
+
+        AssertAppearsInOrder(
+            source,
+            "$sourceCommit = (& git -C $Repository rev-parse HEAD).Trim()",
+            "[Diagnostics.FileVersionInfo]::GetVersionInfo($exe).ProductVersion",
+            "$binaryCommitMatch = [regex]::Match(",
+            "$commit = if ($null -ne $binaryCommit) { $binaryCommit } else { $sourceCommit }",
+            "$binaryMatchesSource = $null -ne $binaryCommit -and $binaryCommit -eq $sourceCommit");
+        Assert.Contains(
+            "status --short --untracked-files=no",
+            source,
+            StringComparison.Ordinal);
+        Assert.Contains("BinaryProductVersion = $binaryProductVersion", source);
+        Assert.Contains("BinaryCommit = $binaryCommit", source);
+        Assert.Contains("BinaryMatchesSource = $binaryMatchesSource", source);
+        Assert.Contains("TrackedSourceStatus = @($sourceStatus)", source);
+        Assert.Contains(
+            "measured binary commit $binaryCommit differs from checked-out source commit $sourceCommit",
+            source,
+            StringComparison.Ordinal);
+    }
+
     [Fact]
     public void SoakExportsAndSummarizesFrameHistory()
     {

tools/run-connected-r6-soak.ps1

@@ -625,8 +625,35 @@ if (-not $SkipBuild) {
 if (-not (Test-Path -LiteralPath $exe)) { throw "client executable not found: $exe" }
 if (-not (Test-Path -LiteralPath $cliDll)) { throw "CLI assembly not found: $cliDll" }
 
-$commit = (& git -C $Repository rev-parse HEAD).Trim()
+$sourceCommit = (& git -C $Repository rev-parse HEAD).Trim()
-$sourceStatus = @(& git -C $Repository status --short)
+# -SkipBuild is intentionally supported, so the checked-out source commit is
+# not necessarily the binary being measured. Read the SDK-stamped
+# AssemblyInformationalVersion from the executable and make the BINARY commit
+# the baseline identity. Otherwise a docs-only commit after a build can
+# silently mislabel every performance artifact.
+$binaryProductVersion = [Diagnostics.FileVersionInfo]::GetVersionInfo($exe).ProductVersion
+$binaryCommitMatch = [regex]::Match(
+    [string]$binaryProductVersion,
+    '\+([0-9a-fA-F]{40})(?:\.|$)')
+$binaryCommit = if ($binaryCommitMatch.Success) {
+    $binaryCommitMatch.Groups[1].Value.ToLowerInvariant()
+}
+else {
+    $null
+}
+$commit = if ($null -ne $binaryCommit) { $binaryCommit } else { $sourceCommit }
+$binaryMatchesSource = $null -ne $binaryCommit -and $binaryCommit -eq $sourceCommit
+# Generated logs and artifacts may be untracked beside a clean source tree.
+# The reproducibility contract is about tracked source modifications.
+$sourceStatus = @(& git -C $Repository status --short --untracked-files=no)
+if ($null -eq $binaryCommit) {
+    $failures.Add(
+        "client binary ProductVersion '$binaryProductVersion' does not identify a 40-character source commit")
+}
+elseif (-not $binaryMatchesSource) {
+    $warnings.Add(
+        "measured binary commit $binaryCommit differs from checked-out source commit $sourceCommit")
+}
 $videoControllers = @(Get-CimInstance Win32_VideoController -ErrorAction SilentlyContinue | ForEach-Object {
     [pscustomobject]@{ Name = $_.Name; DriverVersion = $_.DriverVersion; AdapterRam = $_.AdapterRAM }
 })
@@ -670,6 +697,11 @@ $acdreamEnvVars = Get-ChildItem Env: | Where-Object { $_.Name -like 'ACDREAM_*'
 $envDisclosure = [pscustomobject][ordered]@{
     Script = 'run-connected-r6-soak.ps1'
     GeneratedUtc = [DateTime]::UtcNow.ToString('O')
+    SourceCommit = $sourceCommit
+    BinaryProductVersion = $binaryProductVersion
+    BinaryCommit = $binaryCommit
+    BinaryMatchesSource = $binaryMatchesSource
+    TrackedSourceStatus = @($sourceStatus)
     Uncapped = [bool]$Uncapped
     DenseTown = [bool]$DenseTown
     CaptureContention = [bool]$CaptureContention
@@ -683,7 +715,9 @@ $envDisclosure | ConvertTo-Json -Depth 4 |
 try {
     $process = Start-Process -FilePath $exe -WorkingDirectory $Repository `
         -RedirectStandardOutput $stdoutLog -RedirectStandardError $stderrLog -PassThru
-    Write-Marker "launch pid=$($process.Id) commit=$commit session='$env:SESSIONNAME'"
+    Write-Marker (
+        "launch pid=$($process.Id) binaryCommit=$commit sourceCommit=$sourceCommit " +
+        "binaryMatchesSource=$binaryMatchesSource session='$env:SESSIONNAME'")
 
     $null = Wait-ForLogPattern $process $stdoutLog 'live: in world' 1 $LoginTimeoutSeconds
     # Attach EventPipe observers only after normal CLR/client startup. Starting
@@ -866,6 +900,10 @@ finally {
         FinishedUtc = [DateTime]::UtcNow.ToString('O')
         ElapsedSeconds = [Math]::Round($stopwatch.Elapsed.TotalSeconds, 3)
         Commit = $commit
+        SourceCommit = $sourceCommit
+        BinaryProductVersion = $binaryProductVersion
+        BinaryCommit = $binaryCommit
+        BinaryMatchesSource = $binaryMatchesSource
         SessionName = $env:SESSIONNAME
         ExitCode = $exitCode
         GracefulExit = $gracefulExit