feat: move to mystmd #2260

Job	Run time
change-detection / Identify source changes	11s
rr-tests / Run cog on README	9s
rr-tests / Action	18s
cookie / Distribution build	10m 51s
cookie / Format	9m 55s
cookie / Check included Noxfile	34s
rr-tests / Run pylint	15s
cookie / Check Python 3.10 on macos-15-intel	4m 57s
cookie / Check Python 3.14 on macos-latest	1m 42s
cookie / Check Python 3.14 on ubuntu-latest	3m 56s
rr-tests / Check Python 3.12 on ubuntu-latest	29s
cookie / Check Python pypy-3.11 on ubuntu-latest	2m 38s
cookie / Check Python 3.10 on windows-latest	3m 44s
rr-tests / Check Python 3.12 on macos-15-intel	1m 18s
rr-tests / Check Python 3.10 on macos-15-intel	55s
rr-tests / Check Python 3.10 on ubuntu-latest	32s
cookie / Check Python 3.14 on macos-15-intel	4m 33s
rr-tests / Check Python 3.10 on macos-latest	39s
rr-tests / Check Python 3.14 on macos-latest	28s
rr-tests / Check Python 3.14 on ubuntu-latest	36s
rr-tests / Check Python 3.10 on windows-latest	1m 8s
rr-tests / Check Python 3.12 on windows-latest	47s
rr-tests / Check Python 3.14 on windows-latest	48s
cookie / Check Python 3.10 on ubuntu-latest	3m 43s
rr-tests / Check Python 3.12 on macos-latest	24s
cookie / Check Python 3.10 on macos-latest	1m 42s
cookie / Check Python 3.14 on windows-latest	3m 25s
rr-tests / Check Python 3.14 on macos-15-intel	2m 22s
cookie / pass	3s
pass	2s
	1h 3m 4s

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