Map Ole2Frame as update-only with the embedded object preserved

Frame corners and the aspect lock are scriptable; the opaque storage and
envelope are excluded and refused on edit. The audit embeds a real PNG
through OCS's own builder and proves it survives DWG and DXF byte-for-byte.
Python creation stays a follow-up.

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 **37 of 43** canvas kinds: 36
-are creatable (the legacy `Polyline` is update-only). This is **not** 37 completed
+v7. The Python feature has explicit writes for **38 of 43** canvas kinds: 36
+are creatable (the legacy `Polyline` and `Ole2Frame` are update-only). This is **not** 38 completed
 kinds: Tolerance, Shape, AttributeEntity, Hatch, MLine, Dimension, MultiLeader, Table, PolygonMesh, PolyfaceMesh, Mesh, Wipeout, Point, Line, Circle, Arc, Ellipse, LwPolyline, Spline, Text, MText, Ray, XLine, Solid and Face3D pass every completion gate; Insert now passes every gate too; the audited Polyline (update-only by decision), Polyline2D and Polyline3D pass every gate that their format allows.
 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, Helix, Underlay, ViewBorder and Light are mapped and integration-tested but blocked at W by acadrust persistence gaps, and RasterImage and Viewport are held short of `Complete` by unverifiable or missing oracles (see the ledger). RasterImage is mapped and integration-tested, held short of `Complete` by unverifiable image-dictionary linkage. The other 6 canvas kinds (SectionSymbol, Region, Body, Solid3D, Surface, Ole2Frame) have only `layer` and are recorded as blocked
+`acadrust` revision `7ea4247`. Leader is mapped and integration-tested but blocked at W by three acadrust persistence gaps (see the ledger). Leader, Helix, Underlay, ViewBorder and Light are mapped and integration-tested but blocked at W by acadrust persistence gaps, and RasterImage and Viewport are held short of `Complete` by unverifiable or missing oracles (see the ledger). RasterImage is mapped and integration-tested, held short of `Complete` by unverifiable image-dictionary linkage. The other 5 canvas kinds (SectionSymbol, Region, Body, Solid3D, Surface) have only `layer` and are recorded as blocked
 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.
 
@@ -175,3 +175,4 @@ exact queue above and update statuses with evidence after each increment.
 - Audited `AttributeDefinition` against acadrust `5b682ed` with a full-field comparison through both formats. Everything passes in DWG. DXF keeps only tag, prompt, value, insertion point, height and rotation because the reader handles eight group codes; alignment, width factor, oblique angle, attribute flags, field length, generation flags, lock and text style reopen as defaults. The kind stays integration-tested and the gap is pinned by canary expectations; the fix belongs in cadcodec's `read_attdef`. The shared driver's block fixture now also serves `MAKEBLOCK` scripts.
 - Decided the two open audit questions. **Insert is creatable** by naming an existing block (existence, ordinary-block and no-cycle checks; attribute records stay with the AttributeEntity flow), which completes the kind. **Legacy Polyline is update-only** with a hint pointing scripts at Polyline2D and Polyline3D, because both formats convert it on save. The generator gained an `update_only_message` for such kinds, integer coordinates are accepted in Insert scales, and the driver gained `MAKEPOLYLINE` and `MAKEBLOCK` fixtures.
 - Wrote up the cadcodec DXF reader gaps as draft issues in [cadcodec-reader-gaps.md](cadcodec-reader-gaps.md) (nothing filed): ATTDEF, boolean groups read through `as_i16()`, UNDERLAY rotation units, LEADER, DRAWINGVIEW/SECTIONLINE dispatch and TABLE merged ranges. Verifying them corrected an earlier attribution: the Spline "DXF drops weights" finding was an OCS bug (the writer emits weights only for a rational spline), now fixed by setting `flags.rational` from the weights, so Spline is complete.
+- Mapped `Ole2Frame` as update-only (queue item 21, previously blocked). OCS already builds real embedded frames (`build_embedded_ole`), which supplied the fixture the blocker was waiting for. Frame corners and the aspect lock are scriptable; the opaque storage and envelope are excluded and refused on edit. The audit proves the embedded picture survives DWG and DXF unchanged. Creation from Python remains a follow-up. The remaining blocked kinds are SectionSymbol, Region, Body, Solid3D and Surface.