fix(cli): guard min-time overflow + normalize 0 exec-timeout to null + stale comment (#54 review)

src/ZB.MOM.WW.ScadaBridge.CLI/Commands/TemplateCommands.cs

@@ -395,6 +395,14 @@ public static class TemplateCommands
             return false;
         }
 
+        // Guard against overflow: reject if amount * factorMs would exceed TimeSpan.MaxValue (in ms).
+        // The divide is safe because factorMs is always >= 1.
+        if (amount > TimeSpan.MaxValue.TotalMilliseconds / factorMs)
+        {
+            error = $"Invalid --min-time-between-runs '{value}': value is too large.";
+            return false;
+        }
+
         // 0 (with or without a unit) → unset, mirroring DurationInput.Compose's non-positive handling.
         duration = amount == 0 ? null : TimeSpan.FromMilliseconds(amount * factorMs);
         return true;