bytecode-serialize/deserialize: sxbc v2 format wrapping compiled code dicts. cek-serialize/deserialize: cek-state v1 format wrapping suspended CEK state (phase, request, env, kont). Both use SX s-expression round-trip via inspect/parse. lib/serialize.sx has pure SX versions. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>