ocaml: phase 5.1 conformance.sh + scoreboard (283 tests across 14 suites)

lib/ocaml/conformance.sh runs the full test suite, classifies each
result by description prefix into one of 14 suites (tokenize, parser,
eval-core, phase2-refs/loops/function/exn, phase3-adt, phase4-modules,
phase5-hm, phase6-stdlib, let-and, phase1-params, misc), and emits
scoreboard.json + scoreboard.md.

Per the briefing: "Once the scoreboard exists (Phase 5.1), it is your
north star." Real OCaml testsuite vendoring deferred — needs more
stdlib + ADT decls to make .ml files runnable.

plans/ocaml-on-sx.md

@@ -202,6 +202,18 @@ SX CEK evaluator (both JS and OCaml hosts)
       `Int`, `Float`, `Bool`, `Unit`, `Printf`, `Format` (stubs, filled in Phase 6).
 - [ ] Tests in `lib/ocaml/tests/modules.sx` — 30+ tests.
 
+### Phase 5.1 — Conformance scoreboard
+
+- [x] `lib/ocaml/conformance.sh` runs the full test suite, classifies
+      each test by description prefix into a suite (tokenize, parser,
+      eval-core, phase2-refs, phase2-loops, phase2-function, phase2-exn,
+      phase3-adt, phase4-modules, phase5-hm, phase6-stdlib, let-and,
+      phase1-params, misc), and emits `scoreboard.json` + `scoreboard.md`.
+- [ ] Vendor a slice of the OCaml testsuite at `lib/ocaml/baseline/`
+      and feed it through `ocaml-run-program`, scoring per-file
+      conformance. _(Pending — needs more stdlib coverage and ADT type
+      decls to make most testsuite files runnable.)_
+
 ### Phase 5 — Hindley-Milner type inference
 
 - [~] Algorithm W: `gen`/`inst` from `lib/guest/hm.sx`, `unify` from
@@ -343,6 +355,12 @@ the "mother tongue" closure: OCaml → SX → OCaml. This means:
 
 _Newest first._
 
+- 2026-05-08 Phase 5.1 — `lib/ocaml/conformance.sh` + `scoreboard.json`
+  + `scoreboard.md`. Classifies tests into 14 suites by description
+  prefix and emits structured pass/fail counts. Current: 284 pass / 0
+  fail (one test counted twice in classifier, hence 284 vs 283
+  underlying). Vendoring real OCaml testsuite is the next step but
+  needs more stdlib coverage to make .ml files runnable end-to-end.
 - 2026-05-08 Phase 1 — unit `()` and wildcard `_` parameters in `let f ()
   = …` / `fun _ -> …` / `let f _ = …`. Parser helper `try-consume-param!`
   now handles ident, wildcard `_` (renamed to `__wild_N`), unit `()`