fix: restore strict runtime manifest compatibility

Launcher.Next.Core/ManifestValidator.cs

@@ -10,7 +10,7 @@ public sealed class PackageManifestValidator : IPackageManifestValidator
         var issues = new List<ValidationIssue>();
         if (manifest.SchemaVersion != 1) issues.Add(new("schema", "Unsupported schemaVersion."));
         if (string.IsNullOrWhiteSpace(manifest.PackageId) || string.IsNullOrWhiteSpace(manifest.Version)) issues.Add(new("identity", "packageId and version are required."));
-        if (string.IsNullOrWhiteSpace(manifest.Product) || manifest.ProductYear != productYear) issues.Add(new("product", "Package product or year is incompatible."));
+        if (!string.Equals(manifest.Product, "Plant3D", StringComparison.OrdinalIgnoreCase) || manifest.ProductYear != productYear) issues.Add(new("product", "Package is incompatible with Plant 3D."));
         if (!string.Equals(manifest.Architecture, architecture, StringComparison.OrdinalIgnoreCase)) issues.Add(new("architecture", "Package architecture is incompatible."));
         var paths = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
         foreach (var file in manifest.Files)
@@ -25,3 +25,16 @@ public sealed class PackageManifestValidator : IPackageManifestValidator
         return issues.Count == 0 ? ValidationResult.Success : new ValidationResult(issues);
     }
 }
+
+/// <summary>Structural validation for product-neutral catalog acquisition; it is
+/// deliberately not a substitute for a product compatibility policy.</summary>
+public sealed class StructuralPackageManifestValidator
+{
+    public ValidationResult Validate(PackageManifest manifest)
+    {
+        if (string.IsNullOrWhiteSpace(manifest.Product))
+            return new ValidationResult([new("product", "Package product is required.")]);
+        return new PackageManifestValidator().Validate(
+            manifest with { Product = "Plant3D" }, manifest.ProductYear, manifest.Architecture);
+    }
+}

tests/Launcher.Next.Tests/FoundationTests.cs

@@ -11,6 +11,8 @@ public sealed class FoundationTests
     private static PackageRequirement Requirement(string version = "2026.1.0", bool offline = true, string product = "Plant3D", int year = 2026, string architecture = "x64", string channel = "pilot", string roster = "project-a") => new("P_Rec_Annot", product, year, architecture, channel, version, roster, offline);
     private static PackageFile Package(string path, string hash = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA") => new(path, 1, hash);
     [Fact] public void Manifest_ValidPackage_IsAccepted() => Assert.True(new PackageManifestValidator().Validate(Manifest(Package("PRecAnnot.Plant3D2026.dll")), 2026, "x64").IsValid);
+    [Fact] public void Manifest_DirectValidator_RejectsUnknownProduct() => Assert.False(new PackageManifestValidator().Validate(Manifest(Package("PRecAnnot.Plant3D2026.dll")) with { Product = "UnknownProduct" }, 2026, "x64").IsValid);
+    [Fact] public void StructuralManifestValidator_AllowsExplicitNonPlantProductStructure() => Assert.True(new StructuralPackageManifestValidator().Validate(Manifest(Package("PRecAnnot.Plant3D2026.dll")) with { Product = "Revit" }).IsValid);
     [Fact] public void Manifest_PathTraversal_IsRejected() => Assert.False(new PackageManifestValidator().Validate(Manifest(Package("../evil.dll")), 2026, "x64").IsValid);
     [Fact] public void Manifest_AbsolutePath_IsRejected() => Assert.False(new PackageManifestValidator().Validate(Manifest(Package("C:\\evil.dll")), 2026, "x64").IsValid);
     [Fact] public void Manifest_MissingEntryAssembly_IsRejected() => Assert.False(new PackageManifestValidator().Validate(Manifest(Package("Other.dll")), 2026, "x64").IsValid);