Fix conformance gaps: exception types, byte/getBytes, host classes

Shake-out from the conformance-library sweep. Host-side fixes (runtime .ss,
no re-mint) plus one analyzer change (re-minted):

- Exception fidelity: ex-info and host-constructed throwables (RuntimeException.
  etc.) now carry their JVM class, so (class e), instance? across the exception
  hierarchy, .getMessage, and clojure.test thrown?/thrown-with-msg? all work.
- .getBytes returns a seqable/countable byte-array and honors UTF-16/UTF-32;
  String. decodes them. ->bytevector accepts byte-arrays (Base64).
- Universal .getClass / .toString / .indexOf / .lastIndexOf on any value/seq.
- record? uses the host jrec? predicate (the old (get x :jolt/deftype) crashed
  on a sorted-map by invoking its comparator).
- extend-protocol to abstract host types (clojure.lang.Fn/IFn/APersistentVector,
  java.net.URI) dispatches.
- New host classes: clojure.lang.PersistentQueue, java.util.ArrayList,
  java.net.URI, java.io.File / java.util.UUID ctors, Double/Float ctors+statics,
  regex instance? Pattern, System/setProperty.
- *assert* / *print-readably* are real settable/bindable vars.
- (symbol "ns/name") splits the namespace at the last slash.
- letfn fn params desugar destructuring (analyzer; re-minted).

unit.edn gains exinfo/hostobj/queue/hostctor/destructure regression rows.

host/chez/rt.ss

@@ -38,6 +38,17 @@
                  jolt-kw-message msg
                  jolt-kw-data data
                  jolt-kw-cause (if (null? more) jolt-nil (car more))))
+;; A host-constructed throwable (RuntimeException. etc.): an ex-info-shaped map
+;; carrying its canonical JVM :jolt/class, so (class …) / instance? / .getMessage /
+;; ex-message all reflect the real type. Plain ex-info has no :jolt/class (its class
+;; defaults to clojure.lang.ExceptionInfo), so those maps stay byte-identical.
+(define jolt-kw-class (keyword "jolt" "class"))
+(define (jolt-host-throwable class-name msg . more)
+  (jolt-hash-map jolt-kw-ex-type jolt-kw-ex-info
+                 jolt-kw-class class-name
+                 jolt-kw-message msg
+                 jolt-kw-data jolt-nil
+                 jolt-kw-cause (if (null? more) jolt-nil (car more))))
 
 ;; --- host interop (jolt-0kf5) ------------------------------------------------
 ;; (.method target arg*) lowers to (jolt-host-call "method" target arg*). JVM
@@ -331,6 +342,11 @@
 ;; it. After the dispatchers it chains.
 (load "host/chez/natives-array.ss")
 
+;; clojure.lang.PersistentQueue (jolt-b8he): a functional queue + EMPTY static.
+;; Chains seq/count/empty?/peek/pop/conj/sequential?/class/instance?/printer, so
+;; load after natives-array (the dispatchers it extends).
+(load "host/chez/natives-queue.ss")
+
 ;; syntax-quote form builders (jolt-r9lm, inc6b): __sqcat/__sqvec/__sqmap/__sqset/
 ;; __sq1, def-var!'d into clojure.core. A cross-compiled macro expander (analyzer
 ;; on Chez, inc6b) calls these to build its expansion as reader forms. Needs the