feat(format): select_wrap and join_wrap with when_long via Doc-IR

docs/todo.md

@@ -167,7 +167,7 @@ Legend: ✅ done · 🚧 in progress · ⬜ not started
   function call at the token level — formatted without space (known limitation).
 - Note: SQL keywords inside PL/pgSQL function bodies remain lowercase (matching
   the corpus golden files); casing is applied only to top-level DML.
-- ✅ Doc-IR core (`pkg/format/doc.go`: Text/Line/SoftLine/Group/Indent/IfBreak + `Render`) and `line_width` (default 120, 0 = unlimited). First consumer: `where_wrap: when_long` (`dmlWhereWhenLong`). _Still TODO: move the remaining DML builders (select lists, joins, subqueries) from string assembly onto Doc._
+- ✅ Doc-IR core (`pkg/format/doc.go`: Text/Line/SoftLine/Group/Indent/IfBreak + `Render`) and `line_width` (default 120, 0 = unlimited). First consumer: `where_wrap: when_long` (`dmlWhereWhenLong`). `select_wrap` (default `always`) and `join_wrap` (default `never`) also take `always|when_long|never`; `when_long` keeps the SELECT list / `JOIN … ON` on one line when it fits `line_width`, otherwise uses the existing one-column-per-line / ON-per-line layout. Items containing a subquery or wrapped CASE always use the broken layout. _Still TODO: move the remaining DML builders (subqueries, CTEs, VALUES) onto Doc._
 - _Still TODO: LSP range formatting._
 
 ## ✅ Config expansion — DataGrip settings parity