Host completeness for the ring stack (ring-app)

Gaps surfaced loading ring-core / hiccup / config / tools.logging on Chez:

- clojure.java.io/resource — resolve a named resource against the loader's
  source roots (no classpath), returning a slurp-able File.
- (Object.) constructor — a fresh distinct value (lock / unique sentinel).
- *out* / *err* as dynamic vars over a port-writer, so (binding [*out* *err*] …)
  and #'*out* compile and run (tools.logging, selmer).
- :refer :all now registers a refer-all relation, so an unqualified var from a
  (require '[ns :refer :all]) resolves at compile time — including #'var.
- java.lang.Character interop ((.toString \+) etc.).
- StringReader accepts a char[] ((StringReader. (char-array s))), not just a
  String.
- the \p{L} translation stops just below the UTF-16 surrogate gap (\x{D7FF})
  instead of \x{10FFFF} — a range across the surrogates made irregex's char-set
  construction call integer->char on a surrogate and crash.

host/chez/ns.ss

@@ -68,10 +68,14 @@
                   ((string=? (keyword-t-name k) "as")
                    (when (symbol-t? v) (chez-register-alias! cns (symbol-t-name v) target)))
                   ((string=? (keyword-t-name k) "refer")
-                   (when (pvec? v)
-                     (for-each (lambda (n)
-                                 (when (symbol-t? n) (chez-register-refer! cns (symbol-t-name n) target)))
-                               (seq->list v)))))))
+                   (cond
+                     ;; :refer :all — bring in every public var (require :refer :all)
+                     ((and (keyword? v) (string=? (keyword-t-name v) "all"))
+                      (chez-register-refer-all! cns target))
+                     ((pvec? v)
+                      (for-each (lambda (n)
+                                  (when (symbol-t? n) (chez-register-refer! cns (symbol-t-name n) target)))
+                                (seq->list v))))))))
             (loop (cddr xs))))))))
 
 ;; a namespace designator -> its name string (a jns or a symbol; the corpus never