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/prolog/scoreboard.json

@@ -3,5 +3,5 @@
   "total_failed": 0,
   "total": 590,
   "suites": {"parse":{"passed":25,"total":25,"failed":0},"unify":{"passed":47,"total":47,"failed":0},"clausedb":{"passed":14,"total":14,"failed":0},"solve":{"passed":62,"total":62,"failed":0},"operators":{"passed":19,"total":19,"failed":0},"dynamic":{"passed":11,"total":11,"failed":0},"findall":{"passed":11,"total":11,"failed":0},"term_inspect":{"passed":14,"total":14,"failed":0},"append":{"passed":6,"total":6,"failed":0},"reverse":{"passed":6,"total":6,"failed":0},"member":{"passed":7,"total":7,"failed":0},"nqueens":{"passed":6,"total":6,"failed":0},"family":{"passed":10,"total":10,"failed":0},"atoms":{"passed":34,"total":34,"failed":0},"query_api":{"passed":16,"total":16,"failed":0},"iso_predicates":{"passed":29,"total":29,"failed":0},"meta_predicates":{"passed":25,"total":25,"failed":0},"list_predicates":{"passed":33,"total":33,"failed":0},"meta_call":{"passed":15,"total":15,"failed":0},"set_predicates":{"passed":15,"total":15,"failed":0},"char_predicates":{"passed":27,"total":27,"failed":0},"io_predicates":{"passed":24,"total":24,"failed":0},"assert_rules":{"passed":15,"total":15,"failed":0},"string_agg":{"passed":25,"total":25,"failed":0},"advanced":{"passed":21,"total":21,"failed":0},"compiler":{"passed":17,"total":17,"failed":0},"cross_validate":{"passed":17,"total":17,"failed":0},"integration":{"passed":20,"total":20,"failed":0},"hs_bridge":{"passed":19,"total":19,"failed":0}},
-  "generated": "2026-05-06T21:34:26+00:00"
+  "generated": "2026-05-06T22:23:38+00:00"
 }