v5.7: self-heal GridHigh/GridLow if left at 0 by a restart-timing race

GridHigh/GridLow are never persisted (only lastPivotCalcDate is), so if
two restarts land close together near a server-day boundary, a fresh
process can find lastPivotCalcDate already matching 'today' and skip
CalculatePivotPoints() entirely -- leaving the band at its uninitialized
0/0 and every IsRangingMarket() check failing 'Invalid grid bounds' until
the next real day rollover. Cost XAUUSD/XAGUSD ~17h of dead trading on
2026-07-23 after the drift-enable and sizing deploys landed back-to-back.

Fix: both the OnInit guard and the OnTick day-rollover guard now also
recalc when GridHigh<=0 || GridLow<=0, regardless of date match. The
OnTick path recalcs only (no cancel/reset side effects) when it's the
same-day self-heal case, since that's not a real day transition.

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

OrdersEA_Smart_Grid_BO.mq5

@@ -5,12 +5,12 @@
 //+------------------------------------------------------------------+
 #property copyright "Copyright 2024, Garfield Heron"
 #property link      "https://fetcherpay.com"
-#property version   "5.6"
+#property version   "5.7"
 
 #include <Trade\Trade.mqh>
 #include <Trade\PositionInfo.mqh>
 
-#define VERSION "Version 5.6 Smart Grid Breakout BO MT5"
+#define VERSION "Version 5.7 Smart Grid Breakout BO MT5"
 #define MAX_TRADES 600
 #define MAX_LOG_TRADES 1200
 
@@ -1351,7 +1351,13 @@ int OnInit()
 
    LoadGridState();
 
-   if(lastPivotCalcDate != TodayStartBroker())
+   // GridHigh/GridLow are NOT persisted (only lastPivotCalcDate is) — if a
+   // prior process already recalculated today before this restart, the
+   // date-match guard alone would skip CalculatePivotPoints() and leave the
+   // band at its uninitialized 0/0, causing "Invalid grid bounds" until the
+   // next real day rollover (5.7 fix — cost XAUUSD/XAGUSD ~17h on 2026-07-23
+   // after two restarts landed close together near a day boundary).
+   if(lastPivotCalcDate != TodayStartBroker() || GridHigh <= 0 || GridLow <= 0)
       CalculatePivotPoints();
 
    bGetOutOK        = (GetOut=="L"||GetOut=="l"||GetOut=="A"||GetOut=="a"||
@@ -1471,6 +1477,14 @@ void OnTick()
          cycleProfitStop = false;
       CalculatePivotPoints();  // also updates lastPivotCalcDate & saves
      }
+   else if(GridHigh <= 0 || GridLow <= 0)
+     {
+      // Self-heal (5.7): same-day, but the band was never actually computed
+      // this process (see OnInit comment above). Recalc only — no
+      // cancel/reset, since this isn't a real day transition.
+      PrintS("Grid bounds invalid on same-day check — self-healing recalc");
+      CalculatePivotPoints();
+     }
 
    // --- Profit target check runs every tick (cheap) ---
    if(CheckProfitTarget())