test(lorem-optimum): tag benchmarks :perf and assert on scaling ratios

The benchmark suite carried no tag, so `make test' ran it every time, and three of its tests asserted absolute wall-clock times (`(should (< time 5000.0))' and friends). Those numbers hold on my laptop and break on a slower box.

Every benchmark is now `:perf'-tagged so the default test run skips it. The three absolute learn thresholds collapse into one `benchmark-learn-scaling' test: it times 1K, 10K, and 100K learns and requires each 10x jump in input to cost under 40x the time. Linear scaling lands near 10x, and the 40x ceiling tolerates GC pauses and slow hardware while still catching an O(N^2) regression. The rest drop their absolute `should's and stay as timing reports for `make benchmark'.

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