feat: Phase 3 J/K/L (Sell Decision, Trade Execution, Portfolio Reconciliation) + fix pre-existing build/boot breakage

Completes VS-10/VS-12/VS-14 and makes the solution and Host actually
build and boot for the first time on this branch (main did not build
before this commit).

Root-cause fixes required to reach a green build/boot (not scoped to
J/K/L but blocking any verification of it):
- Restore Polly PackageVersion accidentally deleted from
  Directory.Packages.props (broke KArtSell.Host).
- Remove MediatR dependency from Compliance/VS-04 (package was never
  installed; ICommand/ICommandHandler/IMediator never existed) and
  wire Endpoint -> Handler directly per this repo's convention.
- Migrate FastEndpoints v5 API calls (SendOkAsync/SendAsync/
  SendCreatedAtAsync/SendNotFoundAsync, Description().WithName()) to
  the v7 Send.* fluent API across ~10 endpoint files.
- Fix migrations 0036/0038/0039/0040: rewritten from invalid T-SQL
  (`IF NOT EXISTS ... BEGIN ... END`) to idiomatic Postgres
  (`CREATE TABLE/INDEX IF NOT EXISTS`) — these could not apply to any
  fresh database before this fix.
- Collapse 3 duplicate cross-cutting abstractions that shadowed the
  BuildingBlocks versions and caused type-mismatch compile errors:
  IKrxDataService, IOutboxWriter (ReconcileTradeHandler), IClock
  (ApprovalWorkflow/ApprovalPolicy).
- Inject IClock (BuildingBlocks.Time) in place of direct
  DateTime.Now/UtcNow across 19 files to satisfy the architecture
  test AGENTS.md#DateTime-abstraction rule (13/13 architecture tests
  now pass, was 12/13).
- Register all new and previously-unregistered slices in
  Program.cs DI (SellDecision, TradeExecution, PortfolioReconciliation,
  Compliance, Features/ApprovalWorkflow) — the Host had never
  successfully completed a boot with this code present.
- Disable ("[DontRegister]") the older, route-colliding
  ApprovalWorkflow/ (Workstream H) endpoint set in favor of
  Features/ApprovalWorkflow/ (Workstream G, matches the documented
  Features/<Slice>/ convention); kept for its existing test coverage.
  See TECH_DEBT-017 for the follow-up decision needed.

Verified: dotnet build 0 errors/0 warnings; architecture tests 13/13;
unit tests 54/54 + 18/18; integration tests 34/36 (2 failures are a
local test-DB migration-journal/schema mismatch, not a code defect);
Host boots cleanly and registers all 34 endpoints.

New tech debt recorded: DEBT-017 (duplicate VS-03 implementation),
DEBT-018 (outbox write not co-transactional with entity write in
TradeExecution/PortfolioReconciliation), DEBT-019 (duplicate
BuildingBlocks-shadowing abstractions, partially resolved).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/KArtSell.Modules.ModelOperations/ShadowRun/Features/ImportMarketData/ImportMarketDataHandler.cs

@@ -2,6 +2,8 @@ using System.Security.Cryptography;
 using System.Text;
 using System.Text.Json;
 using Dapper;
+using KArtSell.BuildingBlocks.Time;
+using KArtSell.Modules.ModelOperations.ShadowRun.Services;
 using Microsoft.Extensions.Logging;
 using Npgsql;
 
@@ -18,6 +20,7 @@ public sealed class ImportMarketDataHandler
     private readonly IKrxDataService? _krxService;
     private readonly IOpenDartDataService? _openDartService;
     private readonly IKisDataService? _kisService;
+    private readonly IClock _clock;
     private readonly ILogger<ImportMarketDataHandler> _logger;
 
     public ImportMarketDataHandler(
@@ -25,12 +28,14 @@ public sealed class ImportMarketDataHandler
         IKrxDataService? krxService,
         IOpenDartDataService? openDartService,
         IKisDataService? kisService,
+        IClock clock,
         ILogger<ImportMarketDataHandler> logger)
     {
         _connectionString = connectionString;
         _krxService = krxService;
         _openDartService = openDartService;
         _kisService = kisService;
+        _clock = clock;
         _logger = logger;
     }
 
@@ -41,7 +46,7 @@ public sealed class ImportMarketDataHandler
         ImportMarketDataCommand command,
         CancellationToken cancellationToken)
     {
-        var startTime = DateTime.UtcNow;
+        var startTime = _clock.UtcNow.UtcDateTime;
 
         try
         {
@@ -91,7 +96,7 @@ public sealed class ImportMarketDataHandler
                 errorMessage,
                 cancellationToken);
 
-            var duration = DateTime.UtcNow - startTime;
+            var duration = _clock.UtcNow.UtcDateTime - startTime;
             _logger.LogInformation(
                 "Market data import completed: API={ApiName}, Status={Status}, Rows={RowCount}, Duration={DurationMs}ms",
                 command.ApiName, success ? "SUCCESS" : "FAILURE", rowCount, duration.TotalMilliseconds);
@@ -222,12 +227,12 @@ public sealed class ImportMarketDataHandler
             await conn.ExecuteAsync(sql, new
             {
                 Id = Guid.NewGuid(),
-                ImportAt = DateTime.UtcNow,
+                ImportAt = _clock.UtcNow.UtcDateTime,
                 RowCount = rowCount,
                 Checksum = checksum,
                 Status = status,
                 ErrorMessage = errorMessage,
-                PublishedAt = DateTime.UtcNow,
+                PublishedAt = _clock.UtcNow.UtcDateTime,
                 command.CorrelationId
             });
         }

src/KArtSell.Modules.ModelOperations/ShadowRun/Features/ImportMarketData/ScheduleDailyImportsJob.cs

@@ -1,4 +1,5 @@
 using Hangfire;
+using KArtSell.BuildingBlocks.Time;
 using Microsoft.Extensions.Logging;
 
 namespace KArtSell.Modules.ModelOperations.ShadowRun.Features.ImportMarketData;
@@ -12,15 +13,18 @@ public sealed class ScheduleDailyImportsJob
 {
     private readonly ImportMarketDataHandler _handler;
     private readonly IBackgroundJobClient _jobClient;
+    private readonly IClock _clock;
     private readonly ILogger<ScheduleDailyImportsJob> _logger;
 
     public ScheduleDailyImportsJob(
         ImportMarketDataHandler handler,
         IBackgroundJobClient jobClient,
+        IClock clock,
         ILogger<ScheduleDailyImportsJob> logger)
     {
         _handler = handler;
         _jobClient = jobClient;
+        _clock = clock;
         _logger = logger;
     }
 
@@ -31,7 +35,7 @@ public sealed class ScheduleDailyImportsJob
     [Queue("q-evaluation")]
     public async Task ExecuteAsync(CancellationToken cancellationToken)
     {
-        var importDate = DateOnly.FromDateTime(DateTime.UtcNow);
+        var importDate = DateOnly.FromDateTime(_clock.UtcNow.UtcDateTime);
         var correlationId = Guid.NewGuid();
 
         _logger.LogInformation("Starting daily market data imports: Date={ImportDate}, CorrelationId={CorrelationId}",

src/KArtSell.Modules.ModelOperations/ShadowRun/Services/IKisDataService.cs

@@ -0,0 +1,28 @@
+namespace KArtSell.Modules.ModelOperations.ShadowRun.Services;
+
+public interface IKisDataService
+{
+    /// <summary>
+    /// Fetch trading orders for an account within date range.
+    /// </summary>
+    Task<IReadOnlyList<OrderItem>> GetTradingOrdersAsync(
+        string accountNumber,
+        DateOnly startDate,
+        DateOnly endDate,
+        CancellationToken cancellationToken);
+
+    /// <summary>
+    /// Fetch current portfolio holdings for position reconciliation.
+    /// </summary>
+    Task<IReadOnlyList<PositionItem>> GetPortfolioHoldingsAsync(
+        string accountNumber,
+        CancellationToken cancellationToken);
+
+    /// <summary>
+    /// Execute a buy/sell order (production only, not used in shadow run).
+    /// </summary>
+    Task<OrderExecutionResult> ExecuteOrderAsync(
+        string accountNumber,
+        OrderRequest request,
+        CancellationToken cancellationToken);
+}

src/KArtSell.Modules.ModelOperations/ShadowRun/Services/IKrxDataService.cs

@@ -1,21 +0,0 @@
-namespace KArtSell.Modules.ModelOperations.ShadowRun.Services;
-
-public interface IKrxDataService
-{
-    /// <summary>
-    /// Fetch daily OHLCV bars for a ticker within date range.
-    /// </summary>
-    Task<IReadOnlyList<DataBackfiller.OhlcvBar>> GetDailyOhlcvAsync(
-        string ticker,
-        DateOnly startDate,
-        DateOnly endDate,
-        CancellationToken cancellationToken);
-
-    /// <summary>
-    /// Fetch fee schedule (transaction costs) for date range.
-    /// </summary>
-    Task<IReadOnlyList<DataBackfiller.FeeScheduleEntry>> GetFeeScheduleAsync(
-        DateOnly startDate,
-        DateOnly endDate,
-        CancellationToken cancellationToken);
-}

src/KArtSell.Modules.ModelOperations/ShadowRun/Services/KisDataService.cs

@@ -1,5 +1,6 @@
 using System.Net;
 using System.Text.Json;
+using KArtSell.BuildingBlocks.Time;
 using Microsoft.Extensions.Caching.Memory;
 using Microsoft.Extensions.Logging;
 
@@ -13,6 +14,7 @@ public sealed class KisDataService : IKisDataService
 {
     private readonly HttpClient _httpClient;
     private readonly IMemoryCache _cache;
+    private readonly IClock _clock;
     private readonly ILogger<KisDataService> _logger;
 
     private const int CacheDurationMinutes = 60;  // 1 hour for positions
@@ -45,10 +47,11 @@ public sealed class KisDataService : IKisDataService
             new EventId(23, nameof(LogRetryError)),
             "Retryable error: {ErrorMessage}");
 
-    public KisDataService(HttpClient httpClient, IMemoryCache cache, ILogger<KisDataService> logger)
+    public KisDataService(HttpClient httpClient, IMemoryCache cache, IClock clock, ILogger<KisDataService> logger)
     {
         _httpClient = httpClient;
         _cache = cache;
+        _clock = clock;
         _logger = logger;
     }
 
@@ -153,7 +156,7 @@ public sealed class KisDataService : IKisDataService
                 quantity: 100,
                 currentPrice: 70000m,
                 totalValue: 7000000m,
-                asOfDate: DateOnly.FromDateTime(DateTime.UtcNow))
+                asOfDate: DateOnly.FromDateTime(_clock.UtcNow.UtcDateTime))
         };
 
         var cacheOptions = new MemoryCacheEntryOptions
@@ -329,3 +332,29 @@ public sealed class KisDataService : IKisDataService
             || (ex.InnerException is TimeoutException);
     }
 }
+
+public record OrderItem(
+    string orderId,
+    string ticker,
+    string side,
+    int quantity,
+    decimal price,
+    DateOnly executedDate,
+    string status);
+
+public record PositionItem(
+    string ticker,
+    int quantity,
+    decimal currentPrice,
+    decimal totalValue,
+    DateOnly asOfDate);
+
+public record OrderRequest(
+    string ticker,
+    string side,
+    int quantity);
+
+public record OrderExecutionResult(
+    bool success,
+    string orderId,
+    string? errorMessage);