Time each hostile readme at two lengths

One ten second budget covered several inputs, so a failure did not say
which had regressed, and it allowed ten times the second a readme is
held to while leaving a slow host little room. A linear render costs
four times as much at four times the length and a quadratic one
sixteen, whatever the host. The cap on unclosed brackets had no check
at all, and the line of \h' escapes timed nothing that is bounded.

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