haskell: reject untypeable programs — hk-typecheck + hk-run-typed (+9 tests, 464/464)

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

lib/haskell/test.sh

@@ -42,9 +42,9 @@ FAILED_FILES=()
 
 for FILE in "${FILES[@]}"; do
   [ -f "$FILE" ] || { echo "skip $FILE (not found)"; continue; }
-  # Load infer.sx only for infer test files (it adds ~6s overhead).
+  # Load infer.sx only for infer/typecheck test files (it adds ~6s overhead).
   INFER_LOAD=""
-  case "$FILE" in *infer*) INFER_LOAD='(load "lib/haskell/infer.sx")' ;; esac
+  case "$FILE" in *infer*|*typecheck*) INFER_LOAD='(load "lib/haskell/infer.sx")' ;; esac
   TMPFILE=$(mktemp)
   cat > "$TMPFILE" <<EPOCHS
 (epoch 1)