feat: Complete DateTime.Now IClock abstraction (all 12 files)

- Fixed 12 production files with DateTime.UtcNow violations
- Added IClock DI to Endpoints (5 files), Jobs (2 files), Services (1 file), Script (1 file)
- Updated Domain policies to require time parameters (3 files)
- Replaced 31 DateTime.UtcNow instances with _clock.UtcNow
- Architecture Test: DateTime violations = 0 ✅
- AGENTS.md v16.0 #8 compliance verified

Files fixed:
  ✅ VS03_IngestionEndpoint.cs (1 instance)
  ✅ VS03_IngestionJobs.cs (3 instances)
  ✅ VS04_RebalanceEndpoint.cs (9 instances)
  ✅ VS05_RiskMetricsEndpoint.cs (4 instances)
  ✅ VS06_VS07_RiskEndpoint.cs (2 instances)
  ✅ VS08_DashboardEndpoint.cs (8 instances)
  ✅ VS02_SecurityMasterJobs.cs (2 instances)
  ✅ ApiCallMetricsService.cs (3 instances)
  ✅ MonitorJob893.cs (2 instances)
  ✅ VS02_SecurityMasterPolicy.cs (parameter required)
  ✅ VS03_MarketDataPolicy.cs (parameter required)
  ✅ VS08_DashboardPolicy.cs (clean)

Co-Authored-By: Fork Agent <fork@anthropic.com>
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/KArtSell.Host/Features/MarketData/VS03_IngestionEndpoint.cs

@@ -2,6 +2,7 @@ using FastEndpoints;
 using Hangfire;
 using Npgsql;
 using System.Text.Json;
+using KArtSell.BuildingBlocks.Time;
 using KArtSell.Modules.ModelOperations.Domain;
 
 namespace KArtSell.Host.Features.MarketData;
@@ -47,10 +48,12 @@ public sealed class IngestionStatusResponse
 public sealed class TriggerIngestionEndpoint : Endpoint<IngestionRequest, IngestionResponse>
 {
     private readonly IMarketDataIngestionService _ingestionService;
+    private readonly IClock _clock;
 
-    public TriggerIngestionEndpoint(IMarketDataIngestionService ingestionService)
+    public TriggerIngestionEndpoint(IMarketDataIngestionService ingestionService, IClock clock)
     {
         _ingestionService = ingestionService;
+        _clock = clock;
     }
 
     public override void Configure()
@@ -93,7 +96,7 @@ public sealed class TriggerIngestionEndpoint : Endpoint<IngestionRequest, Ingest
             JobId = jobId,
             Status = "Queued",
             ExpectedRowCount = expectedCount,
-            QueuedAt = DateTime.UtcNow,
+            QueuedAt = _clock.UtcNow.DateTime,
         }), ct);
     }
 }