Transpiled VM compiles with real native preamble
bootstrap_vm.py preamble now has real implementations for all 48
native OCaml functions: stack ops, frame access, upvalue capture,
closure creation, JIT dispatch, CEK fallback, env walking.
The transpiled sx_vm_ref.ml (25KB) compiles cleanly alongside
sx_vm.ml. 7 logic functions transpiled from vm.sx:
vm-call, vm-resolve-ho-form, vm-call-external,
vm-run, vm-step, vm-call-closure, vm-execute-module
Next: wire callers to use Sx_vm_ref instead of Sx_vm.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>