[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>

design/followups.md

@@ -46,7 +46,11 @@ move to `## Resolved` with a date + commit hash.
 
 **Resolves when:** F19-F26 are all closed and the four DoD bullets above pass.
 
-**Cumulative execution log.** F19 + F23 (`ed17c07`); F24 (`7611d9e`); F20 (`9dfd193`); F22 (`43c10a1`); F21 (`5f98558`); F25 step 1 (`25dbd8d`); F25 step 2 (`a2b8989`); F25 step 3 (`c4bf0a0`); F25 step 4 (`1e59249`); F25 step 5 (`9b8133f`); F25 step 6 (`321b796`); F25 step 7 (`1b1ee1e`); F26 step 1 (`8a0f92b`); F26 step 2 (`14bb529`); example rewrite (`c6570dc`); F25 step 8 (`b543eb1`); F25 step 9 landed in this commit:
+**Cumulative execution log.** F19 + F23 (`ed17c07`); F24 (`7611d9e`); F20 (`9dfd193`); F22 (`43c10a1`); F21 (`5f98558`); F25 step 1 (`25dbd8d`); F25 step 2 (`a2b8989`); F25 step 3 (`c4bf0a0`); F25 step 4 (`1e59249`); F25 step 5 (`9b8133f`); F25 step 6 (`321b796`); F25 step 7 (`1b1ee1e`); F26 step 1 (`8a0f92b`); F26 step 2 (`14bb529`); example rewrite (`c6570dc`); F25 step 8 (`b543eb1`); F25 step 9 (`0441a2e`); F25 step 10 landed in this commit:
+- F25 step 10: PublishWriteComplete + DeleteMonitoredItems — closes out the F25 operation matrix. `build_publish_write_complete_request_body` emits the empty wrapper element per `AsbContracts.cs:204-205` (no body fields beyond ConnectionValidator). `decode_publish_write_complete_response` returns a count of `<ItemWriteComplete>` elements observed; per-element decode (Status array + WriteHandle) is deferred to a later iteration since `ItemWriteComplete` is regular WCF DataContract rather than the binary fast-path. `build_delete_monitored_items_request_body` mirrors AddMonitoredItems but omits the RequireId field per `cs:268-277`. `decode_delete_monitored_items_response` returns the per-item Status array. Two new client wrappers: `publish_write_complete()` and `delete_monitored_items(subscription_id, items)`. 6 new tests cover empty-body shape, ItemWriteComplete counting (0 / 2 elements), DeleteMonitoredItems body shape (carries SubscriptionId + MonitoredItem), DeleteMonitoredItems omits RequireId, and Status round-trip. **F25 operation matrix complete**: AsbClient now wraps every IASBIDataV2 operation: `connect`/`disconnect`/`send_end`/`send_preamble`/`keep_alive` (lifecycle), `register_items`/`unregister_items`/`read`/`write` (items), `create_subscription`/`add_monitored_items`/`publish`/`delete_monitored_items`/`delete_subscription` (subscriptions), `publish_write_complete` (write callback). Workspace: 701 tests pass (was 695, +6).
+
+**Earlier slices:**
+- F25 step 9 (commit `0441a2e`):
 - F25 step 9: Write operation. New `MinimalWriteValue { value: AsbVariant }` carries just the `Value` payload; optional ArrayElementIndex/Comment/HasQT/Status/Timestamp WriteValue fields are deferred to a later iteration once a live capture confirms the WCF DataContract XML form. New `build_write_request_body(items, values, write_handle)` produces the full `WriteBasicRequest` body shape per `AsbContracts.cs:181-194`: Items array uses the IAsbCustomSerializableType binary fast-path (`<Items><ASBIData>{...}</ASBIData></Items>`), each Value's inner `Variant` field also uses the fast-path (`<WriteValue><Value><ASBIData>{...}</ASBIData></Value></WriteValue>`), and WriteHandle is an Int32. New `decode_write_response` returns the per-item Status array. New `client::write(items, values, write_handle)` wrapper. 4 new tests cover Write request body shape (carries Items array, parallel Values array with WriteValue elements, WriteHandle as Int32), parallel-array sizing (2 items + 2 values produces 2 WriteValue elements), Status round-trip, and missing-Status error. Workspace: 695 tests pass (was 691, +4). The IASBIDataV2 read+write+subscribe path is now functionally complete in-memory.
 
 **Earlier slices:**