perf/compare/bench.py launches each IDE in apps.toml on the same project
and measures it from the outside, the same way for each: time to the
project window, to CPU settling and to log markers; memory and CPU of the
whole process tree; idle CPU, exit time, cache and install size. Runs on
Windows, macOS and Linux with psutil; --wipe-caches measures a cold index.
README: a Benchmark section with the first results against IntelliJ IDEA.
