feat(format): Doc-IR core, line_width (120) and where_wrap when_long

docs/config/default.pgtidy.yaml

@@ -29,7 +29,8 @@ indent_join: false         # Extra indentation for JOIN … ON lines
 join_indent_size: 1        # Number of extra indent levels for JOINs
 
 # always | when_long | never
-where_wrap: always         # Each AND/OR condition on its own line
+where_wrap: always         # Each AND/OR condition on its own line (when_long: only if the clause exceeds line_width)
+line_width: 120            # Target width for when_long wrapping; 0 = unlimited
 
 where_and_or_indent: true  # AND/OR indented one level under WHERE
 

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.
-- _Still TODO: Wadler Doc-IR printer for width-aware wrapping of long lines._
+- ✅ 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, CASE, joins, subqueries) from string assembly onto Doc._
 - _Still TODO: LSP range formatting._
 
 ## ✅ Config expansion — DataGrip settings parity