Complete Table host model coverage

Maps rows, columns, merged ranges, style and placement through the generic
generator (now with tuple and usize support), adds grid/merge/reference
validation, and keeps DXF cell merge dimensions in step with merged_ranges.
staged_python_table_lifecycle_over_real_ipc passes the full gate including
DWG and DXF reopen.

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

crates/ocs_plugin_api/build.rs

@@ -786,6 +786,7 @@ fn generate_entity_coverage(out_dir: &Path, registry: &TypeRegistry) {
                             | "annotation_offset"
                     )
                     | ("MultiLeader", _)
+                    | ("Table", _)
                     | (
                         "MLine",
                         "flags"