Phase 3 batch 3 (jolt-1j0), 5 macros. Establishes the macro-body toolkit:
fresh-sym = (symbol (str (gensym))) for a shared explicit jolt symbol (a bare
(gensym) returns a Janet symbol the destructurer rejects), and splicing binding
pairs into a TEMPLATE vector so core-let sees a tuple form, not a runtime pvec.
when-first stays first-based (lazy-safe): Clojure's (seq coll) form realizes an
infinite coll like (repeat nil) under Jolt's eager evaluator and hangs — the
per-batch battery caught it (when_first.cljc). Clojure-correct seq form waits on
Phase 5 laziness.
conformance 228/228 x3, clojure-test-suite 3930, full suite green, bench flat.
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