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.

src/dsl/grammar/ddl.rs

@@ -796,7 +796,7 @@ pub static CHANGE: CommandNode = CommandNode {
     usage_ids: &["parse.usage.change_column"],};
 
 // =================================================================
-// create_table — `create table <Name> [with pk [<col>:<type>[, ...]]]`
+// create_table — `create table <Name> [with pk [<col>(<type>)[, ...]]]`
 //                                          (Phase C)
 // =================================================================
 
@@ -816,7 +816,7 @@ const COL_NAME: Node = Node::Hinted {
 
 const COL_SPEC_NODES: &[Node] = &[
     COL_NAME,
-    Node::Punct(':'),
+    Node::Punct('('),
     Node::Ident {
         source: IdentSource::Types,
         role: "col_type",
@@ -826,6 +826,7 @@ const COL_SPEC_NODES: &[Node] = &[
         writes_column: false,
         writes_user_listed_column: false,
     },
+    Node::Punct(')'),
 ];
 const COL_SPEC: Node = Node::Seq(COL_SPEC_NODES);
 
@@ -884,7 +885,7 @@ fn build_create_table(path: &MatchedPath) -> Result<Command, ValidationError> {
 
     let pk_specs: Vec<(String, Type)> = if names.is_empty() {
         if saw_with {
-            // `with pk` alone — default to id:serial.
+            // `with pk` alone — default to id(serial).
             vec![("id".to_string(), Type::Serial)]
         } else {
             return Err(ValidationError {