Hyperscript conformance: 372→373 — hide/show strategy, generator toEqual

Parser: hide/show handle `with opacity/visibility/display` strategy,
target detection for then-less chaining (add/remove/set/put as boundary).
Generator: inline run().toEqual([...]) pattern for eval-only tests.
Compiler: hide/show emit correct CSS property per strategy.

373/831 (45%)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

sx/sx/nav-tree.sx

@@ -123,6 +123,7 @@
             :href "/sx/(applications.(native-browser))"
             :label "Native Browser")
           (dict :href "/sx/(applications.(sxtp))" :label "SXTP Protocol")
+          (dict :href "/sx/(applications.(pretext))" :label "Pretext")
           (dict
             :href "/sx/(applications.(hyperscript))"
             :label "_hyperscript"