Fix general gaps the hiccup suite shook out

simon/jolt

Six correctness fixes, each a general gap (not hiccup-specific):

- deftype is not a map. jolt treated every deftype instance as a map
  (map?/record?/seqable over its fields); in Clojure only a defrecord is
  map-like, a bare deftype is an opaque object. defrecord now marks its type;
  map?/record?/coll?/seq/empty? gate on it, while a deftype implementing a
  collection interface still dispatches through its methods.

- cross-ns extend-protocol on an imported deftype. register-method built the
  type tag from the *calling* ns + bare name, so (extend-protocol P Raw …) in
  one ns missed a Raw value defined in another. A simple-name index resolves
  the bare name to the type's real tag (local ns still wins).

- str vs print. str of a collection is its readable form (nested strings
  quoted: (str ["x"]) => ["x"]); print leaves them raw. jolt defined print
  as str, conflating the two. Split via a __print1 seam.

- clojure.test thrown? now honors the exception hierarchy (instance?), so
  (thrown? IllegalArgumentException …) matches an ArityException subclass.

- java.net.URI is value-equal (= and hash by string form).

- clojure.walk/macroexpand-all was missing; an unresolved qualified var made
  the analyzer report "Unknown class walk".

deftype/defrecord + print are seed sources, re-minted. hiccup 365->381 of its
own suite; the rest are charset-encoding / var-meta niches.

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