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/spec/entities.toml

@@ -445,7 +445,12 @@ name = "Table"
 acadrust_variant = "Table"
 handle = "Entity"
 collection = "entities"
-description = "Table (read-only): GetEntity kind; generic delete. No typed create/bounds in v1."
+description = "Table: create_table(insertion_point, data[row][col]) builds rows x columns of text cells; non-rectangular grid -> Validation; delete."
+
+[[family.constructor]]
+name = "create_table"
+args = [{ name = "insertion_point", ty = "[f64; 3]" }, { name = "data", ty = "&[Vec<String>]" }]
+op = "CreateTable"
 
 # ============================================================================
 # Cross-cutting ops (generic handles + bulk) — documented in build.rs