feat: scaffold P_Rec_Annot .NET 8 architecture

Plant3D2026/P_Rec_Annot/tools/Build-Bundle.ps1

@@ -0,0 +1,4 @@
+param([ValidateSet('Debug','Release')][string]$Configuration='Release',[string]$Plant3D2026InstallDir)
+$ErrorActionPreference='Stop'
+dotnet build (Join-Path $PSScriptRoot '..\PRecAnnot2026.sln') --configuration $Configuration /p:Plant3D2026InstallDir=$Plant3D2026InstallDir
+Write-Host 'Bundle assembly build completed; deployment is intentionally not performed.'

Plant3D2026/P_Rec_Annot/tools/Validate-Bundle.ps1

@@ -0,0 +1,8 @@
+$ErrorActionPreference='Stop'
+$package=Join-Path $PSScriptRoot '..\bundle\P_Rec_Annot.bundle\PackageContents.xml'
+[xml]$xml=Get-Content -LiteralPath $package
+$entry=$xml.ApplicationPackage.Components.ComponentEntry
+if(@($entry).Count -ne 1){throw 'Bundle must have exactly one entry assembly.'}
+if($entry.ModuleName -match '_netload|OrthoLoader|Settings.xml'){throw 'Legacy loading chain is forbidden.'}
+if($entry.ModuleName -notmatch 'PRecAnnot\.Plant3D2026\.dll'){throw 'Unexpected entry assembly.'}
+Write-Host 'Bundle manifest is structurally valid.'