Conformance inc2: fold the 355 inline conformance cases into the corpus

The corpus only ever saw test/spec/*-spec.janet; the 355 hand-written cases in
test/integration/conformance-test.janet (inline Janet, the lazy-seq / IFn /
destructuring / transducer essentials) were invisible to it and to any non-Janet
runtime. extract-corpus.janet now also pulls that (def cases ...) vector, deduped
by :actual, organized into 41 'conformance / <section>' suites recovered from the
file's ### headers. Corpus 2658 -> 2919 rows (+261 unique).

JVM certification: only 1 new divergence ((/ 2) => 0.5 vs 1/2, the all-double
numeric model) — classified. Chez gates: +1 known host gap (instance? Atom, atom
class identity, Phase 4) allowlisted in both runners; parity rose 2295 -> 2533 on
both, floors raised. Janet gate 155 files 0 failed; certifier green (0 new/stale).

Deferred: 41 non-literal core-async spec rows ((a "src") async-harness wrapper)
need harness context the corpus format doesn't carry — left for inc3.

test/conformance/known-divergences.edn

@@ -140,6 +140,10 @@
   {:suite "clojure.core / leaf batch (complement fnil munge etc.)",
    :label "bigdec",
    :category :numeric-model}
+  {:suite
+   "conformance / native-op parity (compile emits janet ops at guarded arities)",
+   :label "native unary div",
+   :category :numeric-model}
   {:suite "numbers / arithmetic",
    :label "divide to fraction",
    :category :numeric-model}