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>

hosts/ocaml/lib/sx_parser.ml

@@ -65,6 +65,7 @@ let read_string s =
        | 'r' -> Buffer.add_char buf '\r'
        | '"' -> Buffer.add_char buf '"'
        | '\\' -> Buffer.add_char buf '\\'
+       | '/' -> Buffer.add_char buf '/'
        | 'u' ->
          (* \uXXXX — read 4 hex digits, encode as UTF-8 *)
          if s.pos + 4 > s.len then raise (Parse_error "Incomplete \\u escape");