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A defisland that lets users type an SX expression, step through CEK evaluation one transition at a time, and see C/E/K registers update live. Demonstrates that cek-step is pure data->data. - cek.sx geography: add ~geography/cek/demo-stepper island with source input, step/run/reset buttons, state display, step history - platform_js.py: register CEK stepping primitives (make-cek-state, cek-step, cek-terminal?, cek-value, make-env, sx-serialize) so island code can access them Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>