Initial commit: Add project files

templates/vertical-slice/backend/Endpoint.cs

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+using FastEndpoints;
+namespace KArtSell.Modules.__MODULE__.Features.__FEATURE__;
+public sealed class Endpoint(IHandler handler) : Endpoint<Request, Response>
+{
+    public override void Configure() { Post("/api/v1/__MODULE__/__FEATURE__"); Policies("__SLICE_ID__"); }
+    public override async Task HandleAsync(Request request, CancellationToken ct)
+        => await SendOkAsync(await handler.HandleAsync(request, ct), ct);
+}

templates/vertical-slice/backend/Handler.cs

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+namespace KArtSell.Modules.__MODULE__.Features.__FEATURE__;
+public interface IHandler { Task<Response> HandleAsync(Request request, CancellationToken ct); }
+public sealed class Handler : IHandler
+{
+    public Task<Response> HandleAsync(Request request, CancellationToken ct)
+        => throw new NotImplementedException("Load approved server-side PIT context, execute a pure policy, persist decision and Outbox in one transaction.");
+}

templates/vertical-slice/backend/README.md

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+# __SLICE_ID__ __MODULE__.__FEATURE__
+Required before implementation: Requirement/Policy/Data/API/DB/Job/UI/Test IDs, PIT cutoff, state transition, idempotency key, transaction boundary, Outbox event, Golden/boundary/failure/replay tests, metric/alert/runbook/rollback.

templates/vertical-slice/backend/Request.cs

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+namespace KArtSell.Modules.__MODULE__.Features.__FEATURE__;
+public sealed record Request(string IdempotencyKey, string ScopeId, DateTimeOffset AsOf);

templates/vertical-slice/backend/Response.cs

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+namespace KArtSell.Modules.__MODULE__.Features.__FEATURE__;
+public sealed record Response(Guid Id, string Status, string EvidenceHash, DateTimeOffset AsOf);

templates/vertical-slice/backend/Sql.cs

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+namespace KArtSell.Modules.__MODULE__.Features.__FEATURE__;
+internal static class Sql
+{
+    public const string LoadContext = """select /* explicit columns */ 1 where @as_of is not null;""";
+}

templates/vertical-slice/backend/Validator.cs

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+using FluentValidation;
+namespace KArtSell.Modules.__MODULE__.Features.__FEATURE__;
+public sealed class Validator : AbstractValidator<Request>
+{
+    public Validator() { RuleFor(x => x.IdempotencyKey).NotEmpty().MaximumLength(100); RuleFor(x => x.ScopeId).NotEmpty(); RuleFor(x => x.AsOf).NotEmpty(); }
+}