Tech
The undo has to exist before the write does
An agent that changes something runs in the order decide, act, report. Verification, where there is any, reads what already happened. That's a fine shape for a log. As a control it's empty: by the time the check fails, the effect is already on disk, and what's left is describing the damage, attempting a repair nobody verified, or restoring from a backup whose age nobody measured.
For the last few months I've been building the other order, not for one tool but for the whole path a change takes...
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