Add the typed document facade and plugin IPC adapter. Prepare bulk edits
before mutation, preserve undo and dirty state, keep profile elevations,
validate numeric inputs and session bindings, and generate Python constructors
with typed results.
Reuse existing entity transforms and profile conversion. Compute mass
properties and closed-surface bounds in cadkernel; pin its main revision
6a5e6fc2822f6af6b2611cd605b44437b35158f0. Keep plugin API metadata at version 6.
Validation: 646 native application tests, 597 kernel tests, 12 document API
tests, 91 plugin API tests, 3 Python tests, default/IPC feature builds and
wasm32 check passed.
Move the 503-line host-independent entity-conversion module (acadrust EntityType
<-> DTO conversions, transform_entity_geometry, entity_to_profile_curves,
bulge_arc_segment, entity_bounds, entity_kind_name, points_aabb) from
src/app/doc_api_convert.rs into crates/ocs_doc_api/src/convert.rs (host feature).
The host file is now a thin re-export (pub use ocs_doc_api::convert::*) so all
existing crate::app::doc_api_convert::* paths keep working unchanged. Zero
coupling risk (the module only touches acadrust + crate DTOs).
623 host lib + 8 crate + 3 consistency green.
Sebastian