feat: move to mystmd #2258

Job	Run time
change-detection / Identify source changes	8s
cookie / Check included Noxfile	34s
rr-tests / Run pylint	33s
cookie / Format	9m 45s
rr-tests / Run cog on README	19s
rr-tests / Action	19s
cookie / Check Python 3.10 on macos-15-intel	4m 32s
cookie / Check Python 3.14 on ubuntu-latest	4m 8s
cookie / Check Python 3.14 on macos-latest	2m 5s
cookie / Check Python 3.14 on windows-latest	4m 8s
cookie / Check Python 3.10 on ubuntu-latest	3m 33s
cookie / Check Python 3.10 on macos-latest	2m 10s
cookie / Check Python 3.10 on windows-latest	13s
cookie / Check Python 3.14 on macos-15-intel	4m 30s
cookie / Distribution build	10m 12s
cookie / Check Python pypy-3.11 on ubuntu-latest	2m 28s
rr-tests / Check Python 3.14 on macos-15-intel	1m 0s
rr-tests / Check Python 3.14 on macos-latest	29s
rr-tests / Check Python 3.12 on windows-latest	50s
rr-tests / Check Python 3.10 on windows-latest	53s
rr-tests / Check Python 3.14 on ubuntu-latest	51s
rr-tests / Check Python 3.14 on windows-latest	50s
rr-tests / Check Python 3.12 on macos-latest	34s
rr-tests / Check Python 3.10 on ubuntu-latest	31s
rr-tests / Check Python 3.12 on ubuntu-latest	35s
rr-tests / Check Python 3.12 on macos-15-intel	1m 8s
rr-tests / Check Python 3.10 on macos-latest	40s
rr-tests / Check Python 3.10 on macos-15-intel	58s
cookie / pass	4s
pass	3s
	59m 3s

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