Report min_pulse_us in startup messages #915

Job	Run time
tests (ubuntu-latest, tests)	34s
tests (macos-latest, tests)	47s
build (ubuntu-latest, noradio)	1m 48s
tests (windows-latest, tests_nosan)	1m 52s
build (ubuntu-latest, wifi)	2m 10s
build (ubuntu-latest, bt)	2m 2s
build (macos-latest, noradio)	2m 18s
build (macos-latest, wifi)	1m 56s
build (macos-latest, bt)	1m 58s
build (windows-latest, noradio)	3m 59s
build (windows-latest, wifi)	6m 23s
build (windows-latest, bt)	4m 12s
	29m 59s

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