sim-lib-repl
sim-lib-repl is the loadable command-line REPL library for SIM. It exports
cli/main/repl for the bootloader handoff and keeps the read-eval-print core in
the public eval_line helper so hosts can test it in-process.
The library expects the active runtime context to provide a codec, number domains, and evaluator behavior through loaded libraries. It does not install that eval stack itself.