refactor: remove Github RunMode

NuGet mode works correctly for GitHub Actions (the HTML open is already
guarded by [Environment]::UserInteractive which is false on CI runners).
The Github mode was redundant and is removed to keep the interface clean.

Co-authored-by: Copilot <[email protected]>

2 files changed, 7 insertions, 17 deletions

diff --git a/Build-Samples.ps1 b/Build-Samples.ps1
index 50f48949..a479177b 100644
--- a/Build-Samples.ps1
+++ b/Build-Samples.ps1
@@ -39,9 +39,8 @@
     automatically based on the WDK build number.
 
 .PARAMETER RunMode
-    Selects the build environment mode. Valid values: Auto, WDK, NuGet, EWDK, Github.
-    Defaults to 'Auto', which detects the environment automatically (EWDK → WDK → NuGet).
-    'Github' behaves identically to 'NuGet' but suppresses opening the HTML report at the end.
+    Selects the build environment mode. Valid values: Auto, WDK, NuGet, EWDK.
+    Defaults to 'Auto', which detects the environment automatically (NuGet → EWDK → WDK).
 
 .PARAMETER ThrottleLimit
     Maximum parallel build jobs. Defaults to 5 x logical processors.
@@ -70,11 +69,6 @@
     .\Build-Samples -RunMode WDK
 
     Forces WDK mode regardless of environment variables.
-
-.EXAMPLE
-    .\Build-Samples -RunMode Github
-
-    Runs as NuGet mode (reads packages\) without opening the HTML report — intended for CI.
 #>
 
 #Requires -Version 7.0
@@ -87,7 +81,7 @@ param(
     [string]$LogFilesDirectory = (Join-Path (Get-Location) "_logs"),
     [string]$ReportFileName = $(if ([string]::IsNullOrEmpty($env:WDS_ReportFileName)) { "_overview" } else { $env:WDS_ReportFileName }),
     [string]$InfOptions,
-    [ValidateSet('Auto', 'WDK', 'NuGet', 'EWDK', 'Github')]
+    [ValidateSet('Auto', 'WDK', 'NuGet', 'EWDK')]
     [string]$RunMode = 'Auto',
     [int]$ThrottleLimit = 0
 )
@@ -665,7 +659,7 @@ $sortedResults = $buildState.Results | Sort-Object { $_.Sample }
 $sortedResults | ConvertTo-Csv  | Out-File $reportCsvPath
 $sortedResults | ConvertTo-Html -Title "WDK Sample Build Overview" | Out-File $reportHtmlPath
 
-# Only open the HTML report interactively (not in CI/automation or Github mode)
-if (-not $buildEnv.IsGithubMode -and -not $env:BUILD_BUILDID -and [Environment]::UserInteractive) {
+# Only open the HTML report interactively (not in CI/automation)
+if (-not $env:BUILD_BUILDID -and [Environment]::UserInteractive) {
     Invoke-Item $reportHtmlPath
 }
diff --git a/BuildEnvironment.ps1 b/BuildEnvironment.ps1
index 285f3d7e..08f0469e 100644
--- a/BuildEnvironment.ps1
+++ b/BuildEnvironment.ps1
@@ -122,11 +122,10 @@ function Resolve-BuildEnvironment {
         Detects or resolves the active build environment and returns metadata.
     .DESCRIPTION
         When RunMode is 'Auto', checks in priority order: NuGet, EWDK, WDK.
-        When RunMode is 'Github', behaves identically to 'NuGet' and sets IsGithubMode.
         When RunMode is explicitly set to WDK/NuGet/EWDK, skips detection and uses that mode.
         Pass the VsInstallation returned by Initialize-DevShell to avoid prompting the user
         a second time when multiple VS installations are present.
-        Returns a hashtable: Name, BuildNumber (int), NuGetVersion, WdkVsComponentVersion, IsGithubMode.
+        Returns a hashtable: Name, BuildNumber (int), NuGetVersion, WdkVsComponentVersion.
     #>
     param(
         [string]$RepoRoot,
@@ -139,12 +138,9 @@ function Resolve-BuildEnvironment {
         BuildNumber           = [int]0
         NuGetVersion          = ''
         WdkVsComponentVersion = ''
-        IsGithubMode          = $false
     }
 
-    # Resolve effective mode for Github (same path as NuGet)
-    $effectiveMode = if ($RunMode -eq 'Github') { 'NuGet' } else { $RunMode }
-    if ($RunMode -eq 'Github') { $result.IsGithubMode = $true }
+    $effectiveMode = $RunMode
 
     # --- Resolve build environment ---
     if ($effectiveMode -eq 'NuGet' -or