Prepare ms-private 0.0.1 release candidate

src/MsPrivate.Execution.psm1

@@ -0,0 +1,39 @@
+Set-StrictMode -Version Latest
+$ErrorActionPreference='Stop'
+Import-Module (Join-Path $PSScriptRoot 'MsPrivate.IO.psm1') -ErrorAction Stop
+
+function Invoke-MsPrivateGroupPlan {
+    param(
+        [Parameter(Mandatory)][object[]]$Groups,
+        [scriptblock]$OnProgress,
+        [string]$ReportPath
+    )
+    $seen=@{};$known=@{}
+    foreach($group in $Groups){
+        $id=[string]$group.Id
+        if($id-notmatch'^[A-Z][A-Za-z0-9-]*$'-or$seen.ContainsKey($id)-or$group.Action-isnot[scriptblock]){throw "Invalid or duplicate operation group: $id"}
+        foreach($dependency in @($group.DependsOn)){if(-not$known.ContainsKey([string]$dependency)){throw "Operation dependency must reference an earlier group: $id/$dependency"}}
+        $seen[$id]=$true;$known[$id]=$true
+    }
+    $entries=@($Groups|ForEach-Object{[pscustomobject]@{Id=[string]$_.Id;Label=[string]$_.Label;DependsOn=@($_.DependsOn);Status='Pending';Error=$null}})
+    $report=[pscustomobject]@{Schema=1;Kind='MsPrivateRun';CreatedUtc=[DateTime]::UtcNow.ToString('o');CompletedUtc=$null;Status='Running';Entries=$entries}
+    $save={if($ReportPath){Write-MsPrivateJsonAtomic -InputObject $report -Path $ReportPath -Depth 8}}.GetNewClosure();&$save
+    foreach($group in $Groups){
+        $entry=@($entries | Where-Object { $_.Id -ceq [string]$group.Id })[0]
+        $blocked=@($entry.DependsOn | Where-Object {
+            $dependency=[string]$_
+            $dependencyEntry=@($entries | Where-Object { $_.Id -ceq $dependency })
+            $dependencyEntry.Count -ne 1 -or $dependencyEntry[0].Status -ne 'Succeeded'
+        })
+        if($blocked.Count){$entry.Status='SkippedDependency';$entry.Error='Required group did not succeed: '+($blocked-join', ');&$save;continue}
+        $entry.Status='Running';&$save;if($OnProgress){&$OnProgress $entry}
+        try{& $group.Action|Out-Host;$entry.Status='Succeeded'}catch{$entry.Status='Failed';$entry.Error=$_.Exception.Message}
+        &$save
+    }
+    $failed=@($entries | Where-Object { $_.Status -eq 'Failed' }).Count
+    $skipped=@($entries | Where-Object { $_.Status -eq 'SkippedDependency' }).Count
+    $report.Status=if($failed-or$skipped){'PartialFailure'}else{'Completed'};$report.CompletedUtc=[DateTime]::UtcNow.ToString('o');&$save
+    $report
+}
+
+Export-ModuleMember -Function Invoke-MsPrivateGroupPlan