Step 6: 40-lazy.clj tier — canonical CLJS implementations in overlay
New jolt-core/clojure/core/40-lazy.clj tier loads after 30-macros,
so lazy-seq macro is available. Ports 7 functions from CLJS core.cljs
(stripped of chunked-seq branches):
distinct, keep, keep-indexed, map-indexed — lazy-seq + transducer arities
cycle — idx modulo count via nth
repeatedly, repeat, iterate — canonical CLJS lazy definitions
partition-all — lazy with trailing partials via take+nthrest
dedupe — lazy-seq, matches Clojure
interpose kept native (Janet core) — requires core-renames for
compile-mode resolution (drop + interleave + repeat chain cant
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