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Prompt assembly can tell the model which prefix sites changed since an earlier render, but the mode is hardcoded off.
Prompt/context assembly now computes which prefix-ledger sites changed since a prior render epoch, with a mode that can either inject a notice about them into the model's context or run shadow-only and just log via tengu_prefix_ledger_notice. The mode-selection function is currently hardcoded to "off", so this notice does not fire in this build.