增强回测引擎第二版策略与快照层

crates/fidc-core/src/engine.rs

@@ -41,6 +41,7 @@ pub struct DailyEquityPoint {
     pub total_equity: f64,
     pub benchmark_close: f64,
     pub notes: String,
+    pub diagnostics: String,
 }
 
 #[derive(Debug, Clone)]
@@ -126,6 +127,7 @@ where
                     date: execution_date,
                 })?;
             let notes = decision.notes.join(" | ");
+            let diagnostics = decision.diagnostics.join(" | ");
 
             result.equity_curve.push(DailyEquityPoint {
                 date: execution_date,
@@ -134,6 +136,7 @@ where
                 total_equity: portfolio.total_equity(),
                 benchmark_close: benchmark.close,
                 notes,
+                diagnostics,
             });
         }