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Documents and demonstrates serializable CEK state. Type an expression, step to any point, click Freeze to see the frozen SX. Click Thaw to resume from the frozen state and get the result. - New page at /sx/(geography.(cek.freeze)) - Nav entry under CEK Machine - Interactive island demo with step/run/freeze/thaw buttons - Documentation: the idea, freeze format, thaw/resume, what it enables Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>