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/ops.rs

@@ -148,6 +148,15 @@ pub struct AttributeDefinitionSpec {
     pub rotation: f64,
 }
 
+/// Construction spec for a `TABLE`: an insertion point plus a grid of cell
+/// strings (`data[row][column]`).
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct TableSpec {
+    pub insertion_point: [f64; 3],
+    /// Grid of cell text values, rows × columns.
+    pub data: Vec<Vec<String>>,
+}
+
 /// Construction spec for a `RASTER_IMAGE`: an image file placed at
 /// `insertion_point` with per-pixel world-unit vectors `u_vector`/`v_vector` and
 /// pixel `size` (width, height). The host auto-registers the ImageDefinition.
@@ -223,6 +232,7 @@ impl crate::gen::Operation {
             CreateDimensionDiameter(_) => "CreateDimensionDiameter",
             CreateDimensionAngular(_) => "CreateDimensionAngular",
             CreateAttributeDefinition(_) => "CreateAttributeDefinition",
+            CreateTable(_) => "CreateTable",
         }
     }
 }