Add host model integration compatibility tests

docs/plugin-host-model-coverage-ledger.md

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+# OCS canvas kind coverage ledger
+
+Use with [the completion plan](plugin-host-model-completion-plan.md). The baseline below is conservative as of 19 September 2026. `Mapped` means at least one non-layer field is exposed for Python writes; it does **not** mean the kind passes the completion gate. `Update-only` means Python creation is unavailable. `Layer-only` means raw inspection and canvas layer edits exist, but geometry is not mapped. Record actual evidence or a blocking issue before changing any status to `Complete`.
+
+Completion gate codes: **C** = create through Python document model; **R** = read; **E** = edit defining geometry and another property; **D** = delete; **U** = undo/redo and atomic failure; **I** = real IPC plus GUI/canvas pick or observable behavior; **W** = DWG and DXF save/reopen; **V** = invalid-input checks and untouched-field/reference preservation; **P** = portable H7 v5 build. A kind is `Complete` only when **C/R/E/D/U/I/W/V/P** all pass and its property catalog matches implementation. `Blocked` requires a specific dependency or failing fixture.
+
+| Kind | Baseline | Gate evidence / blocker |
+|---|---|---|
+| Point | Mapped | Host transaction test now checks invalid batch rollback, grouped edit undo, and redo; creation/deletion history, real plugin execution, GUI, and DWG/DXF gates remain pending. |
+| Line | Mapped | Actual staged-plugin IPC Python create/edit/delete, three undo entries and undo/redo, and edited DWG/DXF reopen pass in `staged_python_plugin_line_lifecycle_over_real_ipc`. GUI pick/visibility, invalid-input/reference preservation, and document-model create/delete API still pending; not complete. |
+| Circle | Mapped | Full gate pending. |
+| Arc | Mapped | Full gate pending. |
+| Ellipse | Mapped | Existing focused DWG conversion test; full gate pending. |
+| Polyline | Mapped | Full gate pending. |
+| Polyline2D | Mapped | Full gate pending. |
+| Polyline3D | Mapped | Full gate pending. |
+| LwPolyline | Mapped | Full gate pending. |
+| Spline | Mapped | Full gate pending. |
+| Text | Mapped | Full gate pending. |
+| MText | Mapped | Full gate pending. |
+| Ray | Mapped | Focused DWG round trip; full gate pending. |
+| XLine | Mapped | Focused DWG round trip; full gate pending. |
+| Solid | Mapped | Focused DWG round trip; full gate pending. |
+| Face3D | Mapped | Focused DWG round trip; full gate pending. |
+| Insert | Update-only | Transform transaction and undo tested; Python creation, deletion, real IPC/GUI and DWG/DXF gates pending. |
+| Tolerance | Layer-only | Next new kind after integration harness. |
+| Shape | Layer-only | Requires valid shape/style fixture. |
+| AttributeDefinition | Layer-only | Requires block-definition fixture. |
+| AttributeEntity | Layer-only | Requires linked Insert and attribute-sequence fixture. |
+| Hatch | Layer-only | Requires valid boundary and pattern fixtures. |
+| Leader | Layer-only | Requires annotation-linked fixture. |
+| MLine | Layer-only | Requires valid style and vertex fixture. |
+| Dimension | Layer-only | Track individual dimension subtypes. |
+| MultiLeader | Layer-only | Requires nested context and style fixture. |
+| Table | Layer-only | Requires table style and cell fixture. |
+| PolygonMesh | Layer-only | Requires consistent grid/count fixture. |
+| PolyfaceMesh | Layer-only | Requires valid face-index fixture. |
+| Mesh | Layer-only | Requires valid topology fixture. |
+| Helix | Layer-only | Requires valid derived-spline fixture. |
+| RasterImage | Layer-only | Requires image definition and file fixture. |
+| Wipeout | Layer-only | Requires clip and image-definition fixture. |
+| Underlay | Layer-only | Requires external definition/file fixture. |
+| Viewport | Layer-only | Requires layout and view-state fixture. |
+| ViewBorder | Layer-only | Requires linked view records. |
+| SectionSymbol | Layer-only | Requires section-view style and point records. |
+| Light | Layer-only | Requires position/target and photometric-state fixture. |
+| Region | Layer-only | Requires valid ACIS region payload. |
+| Body | Layer-only | Requires valid ACIS body payload. |
+| Solid3D | Layer-only | Requires valid ACIS solid payload. |
+| Surface | Layer-only | Requires valid surface payload. |
+| Ole2Frame | Layer-only | Requires valid embedded-object storage. |
+
+After each increment, update the row with test names, fixture paths, exact passing commands, OCS and PandoraBox commit hashes, and any manual GUI result. If a gate is untested, leave it pending. Do not raise the headline completion count from converter coverage alone.