[M5] mxaccess-asb: F25 step 10 — PublishWriteComplete + DeleteMonitoredItems

Closes out the F25 operation matrix. AsbClient now wraps every
IASBIDataV2 operation:

  Lifecycle:    connect / disconnect / send_end / send_preamble / keep_alive
  Items:        register_items / unregister_items / read / write
  Subscriptions:create_subscription / add_monitored_items / publish
                / delete_monitored_items / delete_subscription
  Write cb:     publish_write_complete

API additions:
* `build_publish_write_complete_request_body()` — empty wrapper
  per `AsbContracts.cs:204-205`. No body fields beyond inherited
  ConnectionValidator.
* `decode_publish_write_complete_response` — returns count of
  `<ItemWriteComplete>` elements observed. Per-element decode
  (Status + WriteHandle) deferred to a later iteration since
  ItemWriteComplete is regular WCF DataContract rather than the
  binary fast-path.
* `build_delete_monitored_items_request_body` — same MonitoredItem
  shape as AddMonitoredItems but omits RequireId per `cs:268-277`.
* `decode_delete_monitored_items_response` — per-item Status array.
* Client wrappers: `publish_write_complete()`,
  `delete_monitored_items(subscription_id, items)`.

6 new tests:
* `publish_write_complete_body_is_empty_wrapper` — body shape.
* `publish_write_complete_response_counts_item_write_complete_elements`
  — counts 2 / 0 elements correctly.
* `publish_write_complete_response_zero_when_no_callbacks`.
* `delete_monitored_items_body_carries_subscription_id_and_items`.
* `delete_monitored_items_body_omits_require_id_field`.
* `delete_monitored_items_response_round_trip`.

Workspace: 701 tests pass (was 695, +6).

Stubbed for future iterations:
* ItemWriteComplete per-element decode (Status + WriteHandle) once
  a live capture confirms the WCF DataContract XML wire form.
* Optional MonitoredItem fields (Active / TimeDeadband /
  ValueDeadband / UserData) — same wire-byte uncertainty.
* Optional WriteValue fields (Comment / Timestamp / etc.).

All wire-byte caveats trace back to live-probe reconciliation
against an actual AVEVA VM.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

rust/crates/mxaccess-asb/src/client.rs

@@ -56,15 +56,18 @@ use crate::contracts::{ItemIdentity, ItemStatus};
 use crate::envelope::{ConnectionValidator, EnvelopeError, SoapEnvelope};
 use crate::operations::{
     AddMonitoredItemsResponse, ConnectResponse, CreateSubscriptionResponse,
-    DeleteSubscriptionResponse, MinimalMonitoredItem, MinimalWriteValue, OperationError,
-    PublishResponse, ReadResponse, RegisterItemsResponse, UnregisterItemsResponse, WriteResponse,
+    DeleteMonitoredItemsResponse, DeleteSubscriptionResponse, MinimalMonitoredItem,
+    MinimalWriteValue, OperationError, PublishResponse, PublishWriteCompleteResponse, ReadResponse,
+    RegisterItemsResponse, UnregisterItemsResponse, WriteResponse,
     build_add_monitored_items_request_body, build_authenticate_me_request_body,
     build_connect_request_body, build_create_subscription_request_body,
-    build_delete_subscription_request_body, build_disconnect_request_body,
-    build_keep_alive_request_body, build_publish_request_body, build_read_request_body,
+    build_delete_monitored_items_request_body, build_delete_subscription_request_body,
+    build_disconnect_request_body, build_keep_alive_request_body, build_publish_request_body,
+    build_publish_write_complete_request_body, build_read_request_body,
     build_register_items_request_body, build_unregister_items_request_body,
     build_write_request_body, decode_add_monitored_items_response, decode_connect_response,
-    decode_create_subscription_response, decode_publish_response, decode_read_response,
+    decode_create_subscription_response, decode_delete_monitored_items_response,
+    decode_publish_response, decode_publish_write_complete_response, decode_read_response,
     decode_register_items_response, decode_unregister_items_response, decode_write_response,
 };
 use crate::{actions, decode_envelope, encode_envelope};
@@ -341,6 +344,40 @@ impl<T: AsyncRead + AsyncWrite + Unpin + Send> AsbClient<T> {
         Ok(decode_read_response(&response.body_tokens)?)
     }
 
+    /// `PublishWriteComplete` operation — long-poll the
+    /// write-completion-callback queue. Mirrors the
+    /// `[OperationContract(Action = "...:publishWriteCompleteIn")]`
+    /// at `AsbContracts.cs:42`. Returns a count of completed writes
+    /// (per-element decode is deferred to a later iteration once a
+    /// live capture confirms the WCF DataContract XML shape).
+    pub async fn publish_write_complete(
+        &mut self,
+    ) -> Result<PublishWriteCompleteResponse, ClientError> {
+        let body = build_publish_write_complete_request_body();
+        let response = self
+            .send_signed_envelope(actions::PUBLISH_WRITE_COMPLETE, body, false)
+            .await?;
+        Ok(decode_publish_write_complete_response(
+            &response.body_tokens,
+        )?)
+    }
+
+    /// `DeleteMonitoredItems` operation — removes items from a
+    /// subscription. Returns the per-item Status array.
+    pub async fn delete_monitored_items(
+        &mut self,
+        subscription_id: i64,
+        items: &[MinimalMonitoredItem],
+    ) -> Result<DeleteMonitoredItemsResponse, ClientError> {
+        let body = build_delete_monitored_items_request_body(subscription_id, items);
+        let response = self
+            .send_signed_envelope(actions::DELETE_MONITORED_ITEMS, body, false)
+            .await?;
+        Ok(decode_delete_monitored_items_response(
+            &response.body_tokens,
+        )?)
+    }
+
     /// `Write` operation — sends a signed `WriteIn` SOAP envelope and
     /// decodes the `WriteResponse` (per-item Status array).
     ///