Add MT5 safety tools to prevent MetaEditor freezes

- check-syntax.sh: Pre-compilation syntax checker for MT4→MT5 issues
- metaeditor-watchdog.sh: Auto-kills stuck MetaEditor processes
- safe-compile.sh: Wrapper with 2-minute timeout for compilations

These tools help prevent the container freeze that occurred when
trying to compile OrdersEA with 100 MT4 syntax errors.

scripts/check-syntax.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+# Syntax checker for MQL5 files before compilation
+
+FILE="$1"
+
+if [ -z "$FILE" ]; then
+    echo "Usage: $0 <filename.mq5>"
+    exit 1
+fi
+
+echo "=== Checking $FILE for obvious MT4→MT5 conversion issues ==="
+
+echo ""
+echo "MT4 functions that won't work in MT5:"
+grep -n "OrderSend(\|OrderClose(\|OrderSelect(\|MarketInfo(\|WindowExpertName(\|IsOptimization(" "$FILE" | head -10
+
+echo ""
+echo "Global variables that should be functions in MT5:"
+grep -n "\bBid\b\|\bAsk\b\|\bDigits\b\|\bPoint\b" "$FILE" | grep -v "SymbolInfoDouble\|SymbolInfoInteger" | head -10
+
+echo ""
+echo "Ticket types (should be ulong, not int):"
+grep -n "int.*ticket\|int.*Ticket" "$FILE" | head -5
+
+echo ""
+echo "WinAPI includes (will fail in Wine/MT5):"
+grep -n "WinAPI\|winuser\|WinUser" "$FILE"
+
+echo ""
+echo "=== Quick Fix Check ==="
+ERRORS=$(grep -c "OrderSelect(\|MarketInfo(\|WindowExpertName(\|IsOptimization(" "$FILE" 2>/dev/null)
+if [ "$ERRORS" -gt 0 ]; then
+    echo "⚠️  WARNING: Found $ERRORS MT4-only functions!"
+    echo "This file will NOT compile in MT5. It needs conversion."
+else
+    echo "✅ No obvious MT4 functions found"
+fi