fix: save autodesign file after autodesign! #426

Job	Run time
Tests on paywalled platforms	0s
Tox test (py38)	3m 33s
Tests on other platforms (windows-2019, 3.10)	4m 30s
Tox test (py39)	3m 27s
Tests on other platforms (windows-2022, 3.11)	4m 12s
Tox test (py310)	3m 32s
Tests on other platforms (windows-2022, 3.12)	4m 17s
Tox test (py311)	3m 30s
Tests on other platforms (macos-13, 3.12)	4m 39s
Tox test (py312-cover)	6m 41s
Tests on other platforms (macos-14, 3.12)	1m 50s
Tox test (docs, graphviz)	1m 43s
Docker image	0s
PyPI packaging	0s
	41m 54s

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