Generated the JSON contracts of the Visual Briefing assistant at compile time

app/MindWork AI Studio/Assistants/VisualBriefing/VisualBriefingArtifactService.Bindings.cs

@@ -204,7 +204,7 @@ public sealed partial class VisualBriefingArtifactService
             return context;
         
         if (path is "$index")
-            return JsonSerializer.SerializeToElement(0);
+            return JsonSerializer.SerializeToElement(0, JSON_OPTIONS);
         
         if (path.StartsWith(".", StringComparison.Ordinal))
             return GetDataAtPath(context, path[1..]);

app/MindWork AI Studio/Assistants/VisualBriefing/VisualBriefingCanonicalJsonContext.cs

@@ -0,0 +1,62 @@
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using System.Text.Json.Serialization;
+
+namespace AIStudio.Assistants.VisualBriefing;
+
+/// <summary>
+/// The contracts with which System.Text.Json writes and reads the canonical JSON of visual briefings, built at
+/// compile time.
+/// </summary>
+/// <remarks>
+/// Much of what these contracts write goes into the hashes of stored briefings, see VisualBriefingJson.Canonical.
+/// The hashes of the artifacts are generic: every list they hash needs a contract of its own. A test fails for a type
+/// which is missing here.
+/// </remarks>
+[JsonSourceGenerationOptions(GenerationMode = JsonSourceGenerationMode.Metadata)]
+
+// The header and the data of an exported briefing, and the build which the progress view shows:
+[JsonSerializable(typeof(VisualBriefingExportManifest))]
+[JsonSerializable(typeof(VisualBriefingBuildRecord))]
+[JsonSerializable(typeof(VisualBriefingCompiledData))]
+[JsonSerializable(typeof(VisualBriefingContentData))]
+[JsonSerializable(typeof(VisualBriefingInteractionData))]
+[JsonSerializable(typeof(VisualBriefingProtectedData))]
+[JsonSerializable(typeof(Dictionary<string, JsonElement>))]
+[JsonSerializable(typeof(JsonElement))]
+[JsonSerializable(typeof(JsonObject))]
+[JsonSerializable(typeof(string))]
+[JsonSerializable(typeof(int))]
+
+// The payload hashes of the artifacts:
+[JsonSerializable(typeof(List<VisualBriefingEvidenceFact>))]
+[JsonSerializable(typeof(List<VisualBriefingEvidenceMetric>))]
+[JsonSerializable(typeof(List<VisualBriefingEvidenceTable>))]
+[JsonSerializable(typeof(List<VisualBriefingSourceCoverage>))]
+[JsonSerializable(typeof(List<VisualBriefingAssetPlanItem>))]
+[JsonSerializable(typeof(List<VisualBriefingPlanSection>))]
+[JsonSerializable(typeof(List<VisualBriefingSlotValue>))]
+[JsonSerializable(typeof(List<VisualBriefingChartSpec>))]
+[JsonSerializable(typeof(List<VisualBriefingControlSpec>))]
+[JsonSerializable(typeof(List<VisualBriefingFormulaSpec>))]
+[JsonSerializable(typeof(Dictionary<string, string>))]
+[JsonSerializable(typeof(Dictionary<string, List<string>>))]
+[JsonSerializable(typeof(VisualBriefingLayoutNode))]
+
+// The prompts of the stages:
+[JsonSerializable(typeof(IEnumerable<VisualBriefingSourcePrompt>))]
+[JsonSerializable(typeof(string[]))]
+[JsonSerializable(typeof(VisualBriefingRequiredSlot[]))]
+[JsonSerializable(typeof(VisualBriefingControlRequirement[]))]
+[JsonSerializable(typeof(VisualBriefingEvidencePrompt))]
+[JsonSerializable(typeof(VisualBriefingParentDesign))]
+
+// The answers of the models:
+[JsonSerializable(typeof(VisualBriefingEvidenceResponse))]
+[JsonSerializable(typeof(VisualBriefingPlanResponse))]
+[JsonSerializable(typeof(VisualBriefingContentResponse))]
+[JsonSerializable(typeof(VisualBriefingDesignResponse))]
+
+// The fingerprint which decides whether the editor holds unsaved changes:
+[JsonSerializable(typeof(VisualBriefingPersistenceFingerprint))]
+internal sealed partial class VisualBriefingCanonicalJsonContext : JsonSerializerContext;

app/MindWork AI Studio/Assistants/VisualBriefing/VisualBriefingJson.cs

@@ -28,7 +28,9 @@ internal static class VisualBriefingJson
     /// and a mismatch makes the store discard the stored artifact. Any change here — a converter, a
     /// naming policy, an encoder — therefore invalidates every briefing that was ever written, which
     /// surfaces as a failed integrity check rather than as a build error. This is why enums stay numeric
-    /// here even though the persisted manifest writes their member names.
+    /// here even though the persisted manifest writes their member names. Unlike other options of the app,
+    /// these are not made read-only right here, because MWAIS0010 wants nothing but the object creation;
+    /// System.Text.Json locks them with their first use anyway.
     /// </remarks>
     [CanonicalJsonConfiguration]
     internal static JsonSerializerOptions Canonical { get; } = new()
@@ -38,6 +40,7 @@ internal static class VisualBriefingJson
         WriteIndented = false,
         Encoder = JavaScriptEncoder.Default,
         UnmappedMemberHandling = JsonUnmappedMemberHandling.Disallow,
+        TypeInfoResolver = VisualBriefingCanonicalJsonContext.Default,
     };
 
     /// <summary>
@@ -52,7 +55,7 @@ internal static class VisualBriefingJson
     /// defined outside the feature, such as the target language and the audience enums. Reading accepts
     /// numbers as well, so manifests written before this distinction existed keep loading.
     /// </remarks>
-    internal static JsonSerializerOptions Persistence { get; } = new()
+    internal static JsonSerializerOptions Persistence { get; } = new JsonSerializerOptions
     {
         PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
         PropertyNameCaseInsensitive = false,
@@ -60,5 +63,6 @@ internal static class VisualBriefingJson
         Encoder = JavaScriptEncoder.Default,
         UnmappedMemberHandling = JsonUnmappedMemberHandling.Disallow,
         Converters = { new JsonStringEnumConverter() },
-    };
+        TypeInfoResolver = VisualBriefingPersistenceJsonContext.Default,
+    }.AsReadOnly();
 }

app/MindWork AI Studio/Assistants/VisualBriefing/VisualBriefingPersistenceJsonContext.cs

@@ -0,0 +1,19 @@
+using System.Text.Json.Serialization;
+
+namespace AIStudio.Assistants.VisualBriefing;
+
+/// <summary>
+/// The contracts with which System.Text.Json reads and writes the files of visual briefings, built at compile time.
+/// </summary>
+[JsonSourceGenerationOptions(GenerationMode = JsonSourceGenerationMode.Metadata)]
+[JsonSerializable(typeof(VisualBriefingManifest))]
+[JsonSerializable(typeof(VisualBriefingEvidenceArtifact))]
+[JsonSerializable(typeof(VisualBriefingPlanArtifact))]
+[JsonSerializable(typeof(VisualBriefingContentArtifact))]
+[JsonSerializable(typeof(VisualBriefingPresentationArtifact))]
+[JsonSerializable(typeof(VisualBriefingBuildRecord))]
+[JsonSerializable(typeof(VisualBriefingOperationDiagnostics))]
+
+// The briefing selected last:
+[JsonSerializable(typeof(Guid?))]
+internal sealed partial class VisualBriefingPersistenceJsonContext : JsonSerializerContext;

app/MindWork AI Studio/Assistants/VisualBriefing/VisualBriefingStore.Projects.cs

@@ -24,7 +24,7 @@ public sealed partial class VisualBriefingStore
         try
         {
             this.LastSelectedBriefingId = briefingId;
-            await WriteTextAtomicAsync(this.SelectionPath(), JsonSerializer.Serialize<Guid?>(briefingId), overwrite: true, token);
+            await WriteTextAtomicAsync(this.SelectionPath(), JsonSerializer.Serialize<Guid?>(briefingId, JSON_OPTIONS), overwrite: true, token);
         }
         finally
         {
@@ -47,7 +47,7 @@ public sealed partial class VisualBriefingStore
                 return;
 
             this.LastSelectedBriefingId = null;
-            await WriteTextAtomicAsync(this.SelectionPath(), JsonSerializer.Serialize<Guid?>(null), overwrite: true, token);
+            await WriteTextAtomicAsync(this.SelectionPath(), JsonSerializer.Serialize<Guid?>(null, JSON_OPTIONS), overwrite: true, token);
         }
         finally
         {
@@ -67,7 +67,7 @@ public sealed partial class VisualBriefingStore
         try
         {
             var serialized = await File.ReadAllTextAsync(path, token);
-            var selected = JsonSerializer.Deserialize<Guid?>(serialized);
+            var selected = JsonSerializer.Deserialize<Guid?>(serialized, JSON_OPTIONS);
             this.LastSelectedBriefingId = selected is not null &&
                                           Directory.Exists(this.BriefingDirectory(selected.Value))
                 ? selected