A mérendő tétel fizetési tilalma a valós állapotot írja le

A szűrő szakasza eddig működő védelmet dokumentált: az IsPendingMeasurementAsync egy
már nem írt Order-szintű IsMeasurable attribútumot olvas - az OrderDto.IsMeasurable a
tételekből származtatott, nem tárolt érték -, ezért a predikátum mindig false. Vevői
checkout ma nincs; a jövőbeli csak lemért, Audited rendelésre engedhet fizetést.
Szándékosan nem javítjuk, amíg a checkout meg nem születik.

A mérésindítás lépéséből kikerült a téves státusz-állítás, helyette a Started
értesítő szerepel.

Nop.Plugin.Misc.AIPlugin/docs/MEASUREMENT.md

@@ -73,7 +73,7 @@ OrderDto (order)
 
 1. **Start Measuring** — `CustomOrderSignalREndpoint.StartMeasuring(orderId, userId)`
    - Sets `MeasurementOwnerId` via GenericAttribute
-   - Order status set to Processing, Payment to Pending
+   - Sends the "order started" customer notification — see [`NOTIFICATION/README.md`](NOTIFICATION/README.md)
    - Broadcasts `SendOrderChanged`
 2. **Weigh pallets** — `CustomOrderSignalREndpoint.AddOrUpdateMeasuredOrderItemPallet()`
    - Same weight formula as shipping
@@ -100,16 +100,20 @@ valid = percentage < ProductDto.AverageWeightTreshold
 
 `OrderDto.IsAllOrderItemAvgWeightValid` = all items pass this check.
 
-### PendingMeasurementCheckoutFilter
+### Payment and the measurable item
 
-ASP.NET Core action filter on the Checkout `ConfirmOrder` action.
+**An order containing a measurable item cannot be paid** — the final amount only exists after weighing. There is
+currently **no customer-facing checkout** in the system; when one is built (a Stripe integration is the plan), it
+may only accept payment for a measured, `Audited` order.
 
-| Step | Action |
-|---|---|
-| Intercept | `ConfirmOrder` POST in CheckoutController |
-| Check | `OrderMeasurementService.IsPendingMeasurementAsync()` |
-| If pending | Set OrderStatus=Processing, PaymentStatus=Pending, redirect to PendingMeasurementWarning |
-| If not pending | Allow normal checkout flow |
+`PendingMeasurementCheckoutFilter` is what remains of that guard, and **today it guards nothing**:
+`OrderMeasurementService.IsPendingMeasurementAsync` reads an order-level `IsMeasurable` GenericAttribute that
+nobody writes any more — `OrderDto.IsMeasurable` is derived from the items (`OrderItemDtos.Any(oi => oi.IsMeasurable)`)
+and never stored — so the predicate is always `false`. The filter is bound to `ConfirmOrder`; were it to fire, it
+would redirect to `PendingMeasurementWarning`, and the `Processing` / `Pending` statuses it sets are not persisted.
+
+Deliberately left unfixed while there is no customer checkout: the guard becomes part of that checkout when it is
+written, not of this filter.
 
 ## Workflow 3: StockTaking