feat: connect formula decisions to learning ledger

src/dotnet/QuantEngine.Application/Services/FormulaService.cs

@@ -8,10 +8,12 @@ namespace QuantEngine.Application.Services
     public class FormulaService
     {
         private readonly IPostgresqlHistoryStore _historyStore;
+        private readonly DecisionLearningService _learningService;
 
-        public FormulaService(IPostgresqlHistoryStore historyStore)
+        public FormulaService(IPostgresqlHistoryStore historyStore, DecisionLearningService learningService)
         {
             _historyStore = historyStore;
+            _learningService = learningService;
         }
 
         public TimingDecisionResult ComputeTimingDecision(Dictionary<string, object> ctx)
@@ -23,6 +25,27 @@ namespace QuantEngine.Application.Services
         public FinalDecisionResult ComputeFinalDecision(Dictionary<string, object> ctx)
             => FormulaEngine.ComputeFinalDecision(ctx);
 
+        public async Task<Guid> ComputeAndRecordFinalDecisionAsync(
+            Dictionary<string, object> ctx,
+            string decisionKey,
+            string instrumentId,
+            string sourceVersion,
+            IEnumerable<FactorEvidenceInput> factorEvidence)
+        {
+            var decision = ComputeFinalDecision(ctx);
+            return await _learningService.RecordDecisionAsync(
+                decisionKey,
+                DateTimeOffset.UtcNow,
+                instrumentId,
+                decision.FinalAction,
+                "PASS",
+                Convert.ToDecimal(decision.PriorityScore),
+                sourceVersion,
+                factorEvidence,
+                new { context_keys = ctx.Keys.OrderBy(key => key).ToArray() },
+                new { formula = "FormulaEngine.ComputeFinalDecision", source_version = sourceVersion });
+        }
+
         public CashShortfallResult ComputeCashShortfallHarness(
             Dictionary<string, object> asResult,
             double totalAsset,