feat: move to mystmd #2257

Job	Run time
change-detection / Identify source changes	11s
rr-tests / Run cog on README	9s
cookie / Distribution build	10m 18s
rr-tests / Run pylint	15s
cookie / Check included Noxfile	35s
cookie / Format	9m 58s
cookie / Check Python 3.10 on macos-15-intel	4m 51s
rr-tests / Action	17s
cookie / Check Python 3.10 on ubuntu-latest	3m 38s
cookie / Check Python 3.10 on windows-latest	4m 24s
cookie / Check Python pypy-3.11 on ubuntu-latest	2m 36s
cookie / Check Python 3.14 on windows-latest	3m 49s
cookie / Check Python 3.14 on macos-15-intel	4m 9s
cookie / Check Python 3.14 on macos-latest	2m 26s
cookie / Check Python 3.14 on ubuntu-latest	4m 41s
rr-tests / Check Python 3.12 on macos-latest	37s
rr-tests / Check Python 3.10 on windows-latest	1m 6s
rr-tests / Check Python 3.10 on ubuntu-latest	31s
rr-tests / Check Python 3.12 on ubuntu-latest	33s
rr-tests / Check Python 3.10 on macos-15-intel	1m 7s
rr-tests / Check Python 3.14 on macos-latest	34s
cookie / Check Python 3.10 on macos-latest	2m 46s
rr-tests / Check Python 3.14 on macos-15-intel	52s
rr-tests / Check Python 3.10 on macos-latest	40s
rr-tests / Check Python 3.14 on ubuntu-latest	37s
rr-tests / Check Python 3.12 on windows-latest	47s
rr-tests / Check Python 3.12 on macos-15-intel	1m 49s
rr-tests / Check Python 3.14 on windows-latest	52s
cookie / pass	4s
pass	5s
	1h 5m 17s

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