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Add `Skills` extension #4483

Job	Run time
checks / pre-commit	1m 9s
checks / docs	1m 45s
checks / test (3.14, locked, windows-latest)	1m 29s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 16s
checks / readme-snippets	16s
checks / test (3.13, locked, ubuntu-latest)	1m 17s
checks / test (3.14, locked, ubuntu-latest)	1m 12s
checks / test (3.11, lowest-direct, windows-latest)	2m 16s
checks / test (3.13, locked, windows-latest)	2m 15s
checks / test (3.14, lowest-direct, windows-latest)	1m 41s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 25s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 33s
checks / test (3.12, locked, ubuntu-latest)	1m 57s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 44s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 14s
checks / test (3.12, lowest-direct, windows-latest)	2m 21s
checks / test (3.12, locked, windows-latest)	1m 42s
checks / test (3.11, locked, ubuntu-latest)	1m 38s
checks / test (3.11, locked, windows-latest)	1m 58s
checks / test (3.10, locked, windows-latest)	1m 44s
checks / test (3.13, lowest-direct, windows-latest)	2m 14s
checks / test (3.10, locked, ubuntu-latest)	2m 4s
checks / test (3.10, lowest-direct, windows-latest)	2m 19s
all-green	3s
	38m 32s