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Add `Skills` extension #4481

Job	Run time
checks / docs	1m 44s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 48s
checks / pre-commit	1m 4s
checks / readme-snippets	16s
checks / test (3.12, locked, ubuntu-latest)	2m 2s
checks / test (3.11, lowest-direct, windows-latest)	2m 2s
checks / test (3.12, lowest-direct, windows-latest)	1m 40s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 26s
checks / test (3.11, locked, ubuntu-latest)	1m 36s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 12s
checks / test (3.11, locked, windows-latest)	2m 15s
checks / test (3.14, lowest-direct, windows-latest)	2m 18s
checks / test (3.12, locked, windows-latest)	2m 34s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 43s
checks / test (3.10, locked, ubuntu-latest)	2m 2s
checks / test (3.10, lowest-direct, windows-latest)	2m 15s
checks / test (3.10, locked, windows-latest)	2m 30s
checks / test (3.14, locked, ubuntu-latest)	1m 31s
checks / test (3.13, lowest-direct, windows-latest)	2m 19s
checks / test (3.13, locked, ubuntu-latest)	1m 17s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 15s
checks / test (3.13, locked, windows-latest)	1m 32s
checks / test (3.14, locked, windows-latest)	2m 30s
all-green	5s
	40m 56s