Bootstrap SX bytecode compiler to native OCaml

Transpile lib/compiler.sx → hosts/ocaml/lib/sx_compiler.ml (42 functions).
The bytecode compiler now runs as native OCaml instead of interpreted SX,
eliminating the 24s JIT warm-up for compiler functions.

- bootstrap_compiler.py: transpiler script (like bootstrap.py for evaluator)
- sx_compiler.ml: 39KB native compiler (compile, compile-module, etc.)
- Bind compile/compile-module as native functions in setup_core_operations
- Add mutable_list to sx_runtime.ml (used by compiler pool)
- Add native parse function (wraps Sx_parser.parse_all)
- compile-match delegated via ref (uses letrec, transpiler can't handle)
- Compile all 23 bytecode modules successfully (was 0/23 due to WASM overflow)

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

hosts/ocaml/lib/sx_runtime.ml

@@ -455,3 +455,6 @@ let strip_prefix s prefix =
 (* debug_log — no-op in production, used by CEK evaluator for component warnings *)
 let debug_log _ _ = Nil
 
+(* mutable_list — mutable list for bytecode compiler pool entries *)
+let mutable_list () = ListRef (ref [])
+