Report: the optimisation campaign, and the 3.1x that is left

Experiment 4 records what each cut was worth, measured on the die at every step, and
the stage table that made the cuts findable at all. Also two corrections to the
document itself:

The data plumbing loaded four of the eight datasets, so the progression table would
have been computed from a subset. It now loads all eight.

A continuation line beginning with `+` is list markup to Typst, so the CSV file names
were rendering as a numbered item at the top of page one. One expression, one line.

The summary no longer ends on the ReleaseFast flag as the best available change; it
ends on the measured 16.99 -> 8.37 ms and on the fact that the target is not met, with
the remaining 6.42 ms of compute broken into the three items it actually consists of.
Saying 'not met' in the summary matters more than the table: the number that was
missed is the one a reader should see first.

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