sort-by, rand-int, shuffle, random-uuid, char-escape-string, and
char-name-string move to 20-coll over the two host seams that stay (rand and
sort — they ARE the randomness/ordering primitives). Canonical upgrades ride
along: sort-by defaults its comparator to compare, so nil sorts FIRST (the
kernel fn used host ordering and put nil last); rand-int truncates toward
zero via int (the kernel fn floored, wrong for negative n); shuffle is a
pure-functional Fisher-Yates over vector assoc and rejects non-collections
(a string is seqable but not shuffleable, as on the JVM — the honest gate
caught that one); random-uuid builds over rand-int and validates through
parse-uuid; the char tables are char-keyed Clojure maps (Clojure's shape —
the seed keeps its private code-keyed copies for pr-render).
22 new spec rows. Gate: jpm test exit 0 verified, suite 4698 >= 4660, bench
parity with main back-to-back (4733 vs 4817).
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