GUEST: step 1 — lib/guest/conformance.{sx,sh} config-driven driver

Extracted the duplicated conformance plumbing into a single driver:

- lib/guest/conformance.sx — two helper fns that emit (gc-result NAME P F T)
  lines for the bash side to grep: gc-dict-result for runners returning
  a {:passed :failed :total} dict, and gc-counters-result for guests that
  bump a global pass/fail counter from a test file load.

- lib/guest/conformance.sh — config-driven bash driver. Sources a per-lang
  conf, locates sx_server, runs sx_server in either single-session "dict"
  mode (one preload + many suite evals) or per-suite "counters" mode
  (fresh sx_server per suite, with shared preloads). Aggregates and writes
  scoreboard.{json,md} via per-lang emit_scoreboard_* functions.

- Ported lib/prolog/conformance.sh and lib/haskell/conformance.sh down to
  one-line wrappers that exec the shared driver against their .conf file.

Verification:
- Prolog: 590/590 — diff vs baseline is timestamp-only.
- Haskell: 156/156 — significantly higher than the 0/18 in baseline. The
  old conformance.sh was buggy (its `(ok-len 3 ...)` grep never matched,
  defaulting every program to 0 pass / 1 fail). Updated baseline to the
  true count; no actual test regressed. Plan baseline cell updated.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lib/haskell/conformance.conf

@@ -0,0 +1,76 @@
+# Haskell-on-SX conformance config — sourced by lib/guest/conformance.sh.
+
+LANG_NAME=haskell
+MODE=counters
+COUNTERS_PASS=hk-test-pass
+COUNTERS_FAIL=hk-test-fail
+TIMEOUT_PER_SUITE=120
+
+PRELOADS=(
+  lib/haskell/tokenizer.sx
+  lib/haskell/layout.sx
+  lib/haskell/parser.sx
+  lib/haskell/desugar.sx
+  lib/haskell/runtime.sx
+  lib/haskell/match.sx
+  lib/haskell/eval.sx
+  lib/haskell/testlib.sx
+)
+
+SUITES=(
+  "fib:lib/haskell/tests/program-fib.sx"
+  "sieve:lib/haskell/tests/program-sieve.sx"
+  "quicksort:lib/haskell/tests/program-quicksort.sx"
+  "nqueens:lib/haskell/tests/program-nqueens.sx"
+  "calculator:lib/haskell/tests/program-calculator.sx"
+  "collatz:lib/haskell/tests/program-collatz.sx"
+  "palindrome:lib/haskell/tests/program-palindrome.sx"
+  "maybe:lib/haskell/tests/program-maybe.sx"
+  "fizzbuzz:lib/haskell/tests/program-fizzbuzz.sx"
+  "anagram:lib/haskell/tests/program-anagram.sx"
+  "roman:lib/haskell/tests/program-roman.sx"
+  "binary:lib/haskell/tests/program-binary.sx"
+  "either:lib/haskell/tests/program-either.sx"
+  "primes:lib/haskell/tests/program-primes.sx"
+  "zipwith:lib/haskell/tests/program-zipwith.sx"
+  "matrix:lib/haskell/tests/program-matrix.sx"
+  "wordcount:lib/haskell/tests/program-wordcount.sx"
+  "powers:lib/haskell/tests/program-powers.sx"
+)
+
+emit_scoreboard_json() {
+  local n=${#GC_NAMES[@]} i sep date_only
+  date_only=$(date '+%Y-%m-%d')
+  printf '{\n'
+  printf '  "date": "%s",\n' "$date_only"
+  printf '  "total_pass": %d,\n' "$GC_TOTAL_PASS"
+  printf '  "total_fail": %d,\n' "$GC_TOTAL_FAIL"
+  printf '  "programs": {\n'
+  for ((i=0; i<n; i++)); do
+    sep=","; [ $i -eq $((n-1)) ] && sep=""
+    printf '    "%s": {"pass": %d, "fail": %d}%s\n' \
+      "${GC_NAMES[$i]}" "${GC_PASS[$i]}" "${GC_FAIL[$i]}" "$sep"
+  done
+  printf '  }\n'
+  printf '}\n'
+}
+
+emit_scoreboard_md() {
+  local n=${#GC_NAMES[@]}
+  local i status p f t prog_pass=0 prog_total=$n date_only
+  date_only=$(date '+%Y-%m-%d')
+  for ((i=0; i<n; i++)); do
+    [ "${GC_FAIL[$i]}" -eq 0 ] && prog_pass=$((prog_pass + 1))
+  done
+  printf '# Haskell-on-SX Scoreboard\n\n'
+  printf 'Updated %s · Phase 6 (prelude extras + 18 programs)\n\n' "$date_only"
+  printf '| Program | Tests | Status |\n'
+  printf '|---------|-------|--------|\n'
+  for ((i=0; i<n; i++)); do
+    p=${GC_PASS[$i]}; f=${GC_FAIL[$i]}; t=${GC_TOTAL_S[$i]}
+    [ "$f" -eq 0 ] && status="✓" || status="✗"
+    printf '| %s.hs | %d/%d | %s |\n' "${GC_NAMES[$i]}" "$p" "$t" "$status"
+  done
+  printf '| **Total** | **%d/%d** | **%d/%d programs** |\n' \
+    "$GC_TOTAL_PASS" "$GC_TOTAL" "$prog_pass" "$prog_total"
+}