Command 'led' is the new generation of 'infra/tools/led'. The strange directory structure here is to allow the side-by-side existence of the old and new led tools.
Once the old generation tool is removed, this will become the new contents of 'infra/tools/led'.
The implementation here defers entirely to go.chromium.org/luci/led, but implements 'job.KitchenSupport' to facilitate working with old-style kitchen jobs. Once kitchen is fully deprecated, this package in infra/ will go away entirely, and the led CIPD package will be produced directly from go.chromium.org/luci/led.