Resolves the deferred partition-all port (jolt-yo3). The earlier CLJ attempt via
lazy take/drop over-realized vs the Janet pstep, tripping the §6.3 laziness
counter. The collection arities now realize EXACTLY n per chunk with a first/rest
loop and continue from the advanced cursor (no re-drop), so (take 3 (partition-all
2 (map counting (range)))) realizes exactly 6 — matching minimal realization in
both interpret and compile modes. Keeps transducer + [n coll] + [n step coll]
arities. letfn-bound recursion sidesteps the compile-mode multi-arity closure bug
(jolt-zxw), like keep-indexed/map-indexed.
Removed from the Janet seed: core-partition-all + its binding + the now-dead
td-partition-all helper (the CLJ version carries its own transducer arity).
Gate: conformance 262x3, lazy-infinite 44/44 (incl the §6.3 partition-all
counter), clojure-test-suite 4004/66, fixpoint, self-host, specs+unit green.
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