Initial commit: Add project files

src/KArtSell.Modules.ModelOperations/Features/GetModelFeedbackLoop/Endpoint.cs

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+using FastEndpoints;
+using KArtSell.Modules.ModelOperations.FeedbackLoop;
+
+namespace KArtSell.Modules.ModelOperations.Features.GetModelFeedbackLoop;
+
+public sealed class Endpoint : EndpointWithoutRequest<Response>
+{
+    public override void Configure()
+    {
+        Get("/model-operations/feedback-loop");
+        Roles("Quant", "Risk", "Compliance", "Operations", "Administrator");
+        Summary(x =>
+        {
+            x.Summary = "Returns the governed continuous model feedback plan.";
+            x.Description = "This endpoint exposes evaluation/proposal stages only. It cannot activate a model or submit an order.";
+        });
+    }
+
+    public override Task HandleAsync(CancellationToken ct)
+    {
+        var stages = ModelFeedbackPlan.Stages.Select(x => new ModelFeedbackStageResponse(
+            x.Order, x.StageCode, x.OperationCode, x.Name, x.AutomationBoundary,
+            x.RequiredEvidence, x.HumanDecision, x.FailureAction)).ToArray();
+        return Send.OkAsync(new Response(ModelFeedbackPlan.Boundary, stages), ct);
+    }
+}

src/KArtSell.Modules.ModelOperations/Features/GetModelFeedbackLoop/Response.cs

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+namespace KArtSell.Modules.ModelOperations.Features.GetModelFeedbackLoop;
+
+public sealed record ModelFeedbackStageResponse(
+    int Order,
+    string StageCode,
+    string OperationCode,
+    string Name,
+    string AutomationBoundary,
+    string RequiredEvidence,
+    string HumanDecision,
+    string FailureAction);
+
+public sealed record Response(string Boundary, IReadOnlyList<ModelFeedbackStageResponse> Stages);