docs: add breaking changes guidance to CLAUDE.md (#1879) #566

Job	Run time
checks / readme-snippets	13s
checks / pre-commit	36s
checks / test (3.10, lowest-direct, ubuntu-latest)	44s
checks / test (3.11, lowest-direct, windows-latest)	2m 31s
checks / test (3.11, highest, windows-latest)	2m 53s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.12, highest, windows-latest)	3m 21s
checks / test (3.12, lowest-direct, windows-latest)	4m 1s
checks / test (3.13, highest, ubuntu-latest)	44s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 12s
checks / test (3.11, highest, ubuntu-latest)	50s
checks / test (3.10, highest, ubuntu-latest)	46s
checks / test (3.12, lowest-direct, ubuntu-latest)	51s
checks / test (3.12, highest, ubuntu-latest)	55s
checks / test (3.10, highest, windows-latest)	2m 22s
checks / test (3.10, lowest-direct, windows-latest)	2m 20s
checks / test (3.13, highest, windows-latest)	2m 35s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.13, lowest-direct, windows-latest)	2m 26s
checks / test (3.14, highest, ubuntu-latest)	1m 8s
checks / test (3.14, highest, windows-latest)	2m 22s
checks / test (3.14, lowest-direct, windows-latest)	2m 38s
	36m 57s

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