Ports list/vector/map literals and the quote family (' ` ~ ~@ @) + metadata (^)
to the portable Clojure reader. read-form now returns a [kind payload pos] control
triple (:form / :skip / :splice) instead of the Janet reader's :jolt/skip sentinel
FORMS — out-of-band control is collision-free and host-neutral (no tagged struct
to build or recognize). read-delimited dispatches the kinds; read-next-form skips
comments where a single datum is needed; read-map pairs k/v skipping trivia in
either slot. syntax-quote of a self-evaluating literal collapses at read time.
Four host constructors added to the contract (host_iface): form-make-list/vector/
map + form-sym-merge-meta (attach ^meta to a symbol). form-make-map reuses the
seed's reader-map (now public) for the source-order kv tracking. The portable
reader accumulates items in a jolt vector and the host builds its native form rep.
Gate: reader-parity 107/107 (lists/vectors/maps incl. nested + comments-in-coll,
quote/syntax-quote-collapse/unquote/deref, ^:dynamic/^Type/^{} meta). Full jpm gate
green (prelude cache pre-warmed — a cold cache races under the parallel gate when
the jolt-chez fingerprint changes; pre-existing, see new bead). jolt-sh1n.
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