test: fold phase ports into spec; promote compile-mode test

Mine the phase* port batteries into the spec layer and delete them (their
behavior is now covered by spec): phase5 (hierarchies), phase6 (tagged
literals/reader-conditionals), phase7 (lazy/sets), phase8+phase12 (protocols;
phase12 was a duplicate of phase8), phase10 (strings/set), phase13
(reify/walk). Unique cases mined into spec: reader #inst/#uuid/#?@ splice,
(Type. args) dot constructor, lazy-seq body-runs-once, keywordize-keys/
stringify-keys, custom :default key and explicit :hierarchy dispatch.

phase6-final tested the COMPILE-MODE path ({:compile? true}), distinct from the
interpreter-based spec — kept and renamed integration/compile-mode-test.

jpm test green, conformance 218/218.

test/spec/protocols-spec.janet

@@ -43,4 +43,8 @@
   ["satisfies? false"     "false"
    "(do (defprotocol P (m [_])) (defrecord R []) (satisfies? P (->R)))"]
   ["instance? record"     "true"
-   "(do (defrecord R [a]) (instance? R (->R 1)))"])
+   "(do (defrecord R [a]) (instance? R (->R 1)))"]
+  ["dot constructor"      "5"
+   "(do (deftype P [n]) (.-n (P. 5)))"]
+  ["dot ctor + method"    "5"
+   "(do (defprotocol G (val-of [_])) (deftype P [n] G (val-of [_] n)) (val-of (P. 5)))"])