ocs_doc_api: Phase 5-ii — typed Table create

- CreateTable(TableSpec{insertion_point, data[row][col]}) op (append-only).
- backend add_table via Table::new(insertion_point, rows, cols) + set_cell_text
  (Table::default() pre-creates 3x3, so use Table::new for exact dims).
- executor validates non-empty rectangular grid; facade create_table.
- spec Table constructor; api_reference + binding_schema regenerated; mocks + baseline.
- Test phase5ii_create_table_from_grid (3x2 grid, non-rectangular rejected)
  -> 615 host lib + 3 consistency green. Phase 5 complete.

crates/ocs_doc_api/src/gen/api_reference.md

@@ -185,7 +185,11 @@ Raster image: create_raster_image(file_path, insertion, u, v, size) places an im
 
 ## `Entity` (acadrust `Table`, collection `entities`)
 
-Table (read-only): GetEntity kind; generic delete. No typed create/bounds in v1.
+Table: create_table(insertion_point, data[row][col]) builds rows x columns of text cells; non-rectangular grid -> Validation; delete.
+
+### Constructors (`doc.entities()`)
+
+- **create_table**(insertion_point: [f64; 3], data: &[Vec<String>]) -> `Entity` — `CreateTable`
 
 ## Generic methods (every handle)