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Add `Skills` extension #4487

Job	Run time
checks / pre-commit	59s
checks / test (3.10, lowest-direct, windows-latest)	2m 11s
checks / docs	1m 51s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 29s
checks / test (3.12, locked, ubuntu-latest)	2m 1s
checks / test (3.11, locked, ubuntu-latest)	1m 40s
checks / test (3.12, lowest-direct, windows-latest)	2m 22s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 28s
checks / test (3.12, locked, windows-latest)	2m 36s
checks / test (3.14, lowest-direct, windows-latest)	1m 45s
checks / test (3.11, locked, windows-latest)	2m 6s
checks / readme-snippets	17s
checks / test (3.13, locked, windows-latest)	2m 17s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 15s
checks / test (3.10, locked, windows-latest)	2m 29s
checks / test (3.14, locked, ubuntu-latest)	1m 36s
checks / test (3.13, locked, ubuntu-latest)	1m 31s
checks / test (3.14, locked, windows-latest)	2m 31s
checks / test (3.13, lowest-direct, windows-latest)	2m 20s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 33s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 36s
checks / test (3.11, lowest-direct, windows-latest)	2m 8s
checks / test (3.10, locked, ubuntu-latest)	1m 57s
all-green	4s
	42m 2s