Grammar: with-pk column specs use name(type), matching add column

`create table … with pk` parsed column types as `name:type`,
while `add column` uses `name(type)`. Unify on the parens
form so column-type syntax is consistent across the DSL:

    create table T with pk id(serial), name(text)

Only `COL_SPEC` changes (`:` → `( … )`); `build_create_table`
reads columns by role, so it is unaffected. The `:` that
separates table from column in `add column` / `drop column`
is unchanged. Sweeps the test suite, the typing-surface
matrix (two `after_colon` cells renamed to `after_paren`,
4 snapshots regenerated), the friendly catalog's usage
templates, ADR-0009's example, and requirements.md.

1039 passing / 0 failing / 1 ignored; clippy clean.

tests/iteration3_rebuild.rs

@@ -48,7 +48,7 @@ fn rebuild_restores_schema_only_project() {
                     ColumnSpec { name: "Name".to_string(), ty: Type::Text },
                 ],
                 vec!["id".to_string()],
-                Some("create table Customers with pk id:serial".to_string()),
+                Some("create table Customers with pk id(serial)".to_string()),
             )
             .await
             .unwrap();
@@ -414,7 +414,7 @@ fn rebuild_restores_indexes() {
                     ColumnSpec { name: "Email".to_string(), ty: Type::Text },
                 ],
                 vec!["id".to_string()],
-                Some("create table Customers with pk id:serial".to_string()),
+                Some("create table Customers with pk id(serial)".to_string()),
             )
             .await
             .unwrap();