haskell: Phase 12 conformance — uniquewords.hs (4/4) + setops.hs (8/8), Phase 12 complete

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

plans/haskell-completeness.md

@@ -213,7 +213,7 @@ No OCaml changes are needed. The view type is fully representable as an SX dict.
 - [x] Unit tests in `lib/haskell/tests/set.sx` (17/17, plan ≥15: empty, insert,
   member hit/miss, delete, fromList deduplication, union, intersection,
   difference, isSubsetOf, plus 4 end-to-end via `import qualified Data.Set`).
-- [ ] Conformance programs:
+- [x] Conformance programs:
   - `uniquewords.hs` — unique words in a string using `Data.Set`.
   - `setops.hs` — set union/intersection/difference on integer sets;
     exercises all three combining operations.
@@ -307,6 +307,14 @@ No OCaml changes are needed. The view type is fully representable as an SX dict.
 
 _Newest first._
 
+**2026-05-07** — Phase 12 conformance: uniquewords.hs (4/4) + setops.hs (8/8) → Phase 12 complete:
+- `program-uniquewords.sx`: `foldl Set.insert` over a word list, then check
+  `Set.size`/`member`. 4/4.
+- `program-setops.sx`: full set algebra — union/intersection/difference/
+  isSubsetOf with three sets s1, s2, s3 chosen so each operation has both a
+  positive and negative test. 8/8.
+- Both added to `PROGRAMS` in `conformance.sh`. Phase 12 fully complete.
+
 **2026-05-07** — Phase 12 unit tests `tests/set.sx` (17/17):
 - 13 SX-level direct calls + 4 end-to-end via `import qualified Data.Set`.
   Covers all the API + dedupe behavior. Suite is 17/17.