Complete Wipeout host model coverage

Maps the placement, display and clip-boundary fields with rectangular and
polygonal clip validation. staged_python_wipeout_lifecycle_over_real_ipc
passes the full gate including DWG and DXF reopen with re-edit.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/plugin-host-model-completion-plan.md

@@ -7,13 +7,13 @@ Build a general Python document model over the OCS host API for all **43 canvas
 As of 20 September 2026, the working branch is `plugin/host-model-api` at
 `a8dd3640` plus the Leader increment, published as draft PR
 [#1391](https://github.com/HakanSeven12/OpenCADStudio/pull/1391). Host API is
-v7. The Python feature has explicit writes for **32 of 43** canvas kinds: 31
-are creatable and `Insert` remains update-only. This is **not** 30 completed
-kinds: Tolerance, Shape, AttributeEntity, Hatch, MLine, Dimension, MultiLeader, Table, PolygonMesh, PolyfaceMesh and Mesh pass every completion gate.
+v7. The Python feature has explicit writes for **33 of 43** canvas kinds: 32
+are creatable and `Insert` remains update-only. This is **not** 33 completed
+kinds: Tolerance, Shape, AttributeEntity, Hatch, MLine, Dimension, MultiLeader, Table, PolygonMesh, PolyfaceMesh, Mesh and Wipeout pass every completion gate.
 AttributeDefinition passes its host and real IPC lifecycle but remains short of
 `Complete` because the previously pinned CAD codec dropped optional ATTDEF
 fields during DXF reads; revalidate that blocker against the current
-`acadrust` revision `7ea4247`. Leader is mapped and integration-tested but blocked at W by three acadrust persistence gaps (see the ledger). Leader and Helix are mapped and integration-tested but blocked at W by acadrust persistence gaps (see the ledger). RasterImage is mapped and integration-tested, held short of `Complete` by unverifiable image-dictionary linkage. The other 11 canvas kinds have only `layer`
+`acadrust` revision `7ea4247`. Leader is mapped and integration-tested but blocked at W by three acadrust persistence gaps (see the ledger). Leader and Helix are mapped and integration-tested but blocked at W by acadrust persistence gaps (see the ledger). RasterImage is mapped and integration-tested, held short of `Complete` by unverifiable image-dictionary linkage. The other 10 canvas kinds have only `layer`
 writes through the document model. All 43 have raw typed snapshots. There are
 three internal records and two opaque fallbacks outside the 43 canvas kinds.
 
@@ -123,7 +123,7 @@ The last five may require new engine capabilities rather than only Python conver
 
 ## Handoff start point
 
-Continue with **Wipeout** (queue item 11). Leader is done except for its W
+Continue with **Underlay** (queue item 12). Leader is done except for its W
 gate; when the engine writes DXF group 340, reads group 213 and the DWG
 R2010+ text-size question is decided, flip the canary assertions in
 `staged_python_leader_lifecycle_over_real_ipc` and mark it `Complete`.
@@ -165,3 +165,4 @@ exact queue above and update statuses with evidence after each increment.
 - Completed `PolygonMesh`, `PolyfaceMesh` and `Mesh` (queue items 6-8) with one shared `run_mesh_lifecycle` test driver and per-kind host validation. The generator now omits a sub-record's own `EntityCommon` from the scripted form. All three pass the full gate including DWG and DXF reopen with re-edit. The queue now continues with `Helix`.
 - Mapped `Helix` with a host-rebuilt spline. `run_mesh_lifecycle` gained per-format DXF expectations so an engine gap is pinned by a canary instead of hidden. All gates pass except W for `handedness` in DXF (reader ignores boolean group 290). The queue now continues with `RasterImage`.
 - Mapped `RasterImage`. The host reads the image file, creates and links the `ImageDefinition`, and derives `size` and the default clip boundary. The shared lifecycle driver passes every gate in OCS with a real PNG; `ACAD_IMAGE_DICT`/reactor creation is not implemented, so the kind stays integration-tested. The queue now continues with `Wipeout`.
+- Completed `Wipeout` (queue item 11) with rectangular and polygonal clip masks through the shared lifecycle driver; scripted creation matches OCS's native command. The queue now continues with `Underlay`.