MetalamaVsx: link to Metalama parent family; GenerateScripts: error on unfetched deps

Author: PostSharpAgent

src/PostSharp.Engineering.BuildTools/ContinuousIntegration/GenerateScriptsCommand.cs

@@ -4,8 +4,10 @@
 using PostSharp.Engineering.BuildTools.Build;
 using PostSharp.Engineering.BuildTools.Build.Files;
 using PostSharp.Engineering.BuildTools.ContinuousIntegration.TeamCity.Generation;
+using PostSharp.Engineering.BuildTools.Dependencies.Model;
 using PostSharp.Engineering.BuildTools.Docker;
 using PostSharp.Engineering.BuildTools.Utilities;
+using System.Linq;
 
 namespace PostSharp.Engineering.BuildTools.ContinuousIntegration;
 
@@ -61,6 +63,21 @@ public static bool Execute( BuildContext context, CommonCommandSettings settings
                 return false;
             }
 
+            // Writing DockerMounts.g.ps1 needs a resolved VersionFile for every non-feed dependency.
+            // We do not fetch automatically here; the user is expected to have run 'dependencies fetch' first.
+            var unfetched = dependenciesOverrideFile.Dependencies
+                .Where( d => d.Value.SourceKind != DependencySourceKind.Feed && d.Value.VersionFile == null )
+                .Select( d => d.Key )
+                .ToList();
+
+            if ( unfetched.Count > 0 )
+            {
+                context.Console.WriteError(
+                    $"Cannot generate scripts: dependencies have not been fetched: {string.Join( ", ", unfetched )}. Run './Build.ps1 dependencies fetch' first." );
+
+                return false;
+            }
+
             if ( !dependenciesOverrideFile.TryWrite( context ) )
             {
                 return false;

src/PostSharp.Engineering.BuildTools/Dependencies/Definitions/MetalamaVsxDependencies.V2026_0.cs

@@ -52,7 +52,7 @@ public MetalamaVsxDependencyDefinition(
                     isVersioned ) { }
         }
 
-        public static ProductFamily Family { get; } = new( _projectName, "2026.0", DevelopmentDependencies.Family )
+        public static ProductFamily Family { get; } = new( _projectName, "2026.0", DevelopmentDependencies.Family, MetalamaDependencies.V2026_0.Family )
         {
             // No UpstreamProductFamily - breaking downstream merge from 2025.1
             // DownstreamProductFamily = V2026_1.Family

src/PostSharp.Engineering.BuildTools/Dependencies/Definitions/MetalamaVsxDependencies.V2026_1.cs

@@ -52,7 +52,7 @@ public MetalamaVsxDependencyDefinition(
                     isVersioned ) { }
         }
 
-        public static ProductFamily Family { get; } = new( _projectName, "2026.1", DevelopmentDependencies.Family )
+        public static ProductFamily Family { get; } = new( _projectName, "2026.1", DevelopmentDependencies.Family, MetalamaDependencies.V2026_1.Family )
         {
             UpstreamProductFamily = V2026_0.Family