haskell: Phase 14 — record syntax in parser (con-rec AST node)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plans/haskell-completeness.md

@@ -247,7 +247,7 @@ No OCaml changes are needed. The view type is fully representable as an SX dict.
 
 ### Phase 14 — Record syntax
 
-- [ ] Parser: extend `hk-parse-data` to recognise `{ field :: Type, … }`
+- [x] Parser: extend `hk-parse-data` to recognise `{ field :: Type, … }`
   constructor bodies. AST node: `(:con-rec CNAME [(FNAME TYPE) …])`.
 - [ ] Desugar: `:con-rec` → positional `:con-def` plus generated accessor
   functions `(\rec -> case rec of …)` for each field name.
@@ -313,6 +313,13 @@ No OCaml changes are needed. The view type is fully representable as an SX dict.
 
 _Newest first._
 
+**2026-05-07** — Phase 14 record parser: `data Foo = Foo { name :: T, … }`:
+- Extended `hk-parse-con-def` to peek for `{` after the constructor name; if
+  found, parse `varid :: type` pairs separated by commas, terminate with `}`,
+  return `(:con-rec name [(fname ftype) …])`. Positional constructors fall
+  through to the existing `:con-def` path. Verified record parses; no
+  regressions in parse.sx (43/43), parser-decls (24/24), deriving (15/15).
+
 **2026-05-07** — Phase 13 conformance: shapes.hs (5/5) → Phase 13 complete:
 - `class Shape` with a default `perimeter` (using a where-clause inside the
   default body), two instances `Square` / `Rect` — Square overrides