docs: add breaking changes guidance to CLAUDE.md #4098

Job	Run time
checks / pre-commit	20s
checks / readme-snippets	13s
checks / test (3.10, highest, windows-latest)	2m 24s
checks / test (3.12, lowest-direct, windows-latest)	3m 48s
checks / test (3.11, lowest-direct, ubuntu-latest)	49s
checks / test (3.14, lowest-direct, windows-latest)	2m 22s
checks / test (3.10, lowest-direct, ubuntu-latest)	44s
checks / test (3.11, highest, ubuntu-latest)	46s
checks / test (3.11, highest, windows-latest)	2m 56s
checks / test (3.11, lowest-direct, windows-latest)	2m 25s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.13, lowest-direct, ubuntu-latest)	42s
checks / test (3.10, lowest-direct, windows-latest)	2m 30s
checks / test (3.12, highest, ubuntu-latest)	51s
checks / test (3.13, highest, ubuntu-latest)	48s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 10s
checks / test (3.14, highest, ubuntu-latest)	1m 16s
checks / test (3.10, highest, ubuntu-latest)	49s
checks / test (3.13, lowest-direct, windows-latest)	2m 19s
checks / test (3.13, highest, windows-latest)	3m 4s
checks / test (3.14, highest, windows-latest)	2m 20s
checks / test (3.12, highest, windows-latest)	3m 25s
	36m 51s

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