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Add cache fields to directory read and `_meta` to `Skill` #4529

Job	Run time
checks / readme-snippets	16s
checks / test (3.15, locked, ubuntu-latest)	1m 33s
checks / pre-commit	54s
checks / test (3.14, locked, windows-latest)	1m 58s
checks / test (3.14, lowest-direct, windows-latest)	2m 19s
checks / test (3.15, lowest-direct, ubuntu-latest)	1m 15s
checks / docs	1m 4s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 22s
checks / test (3.15, lowest-direct, windows-latest)	1m 48s
checks / test (3.13, locked, windows-latest)	2m 14s
checks / test (3.12, locked, windows-latest)	1m 39s
checks / test (3.14, locked, ubuntu-latest)	1m 13s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 30s
checks / test (3.15, locked, windows-latest)	2m 17s
checks / test (3.13, lowest-direct, windows-latest)	2m 18s
checks / test (3.13, locked, ubuntu-latest)	1m 30s
checks / test (3.12, lowest-direct, windows-latest)	2m 21s
checks / test (3.11, locked, ubuntu-latest)	1m 39s
checks / test (3.11, lowest-direct, windows-latest)	1m 49s
checks / test (3.11, locked, windows-latest)	2m 27s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 46s
checks / test (3.12, locked, ubuntu-latest)	1m 58s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 5s
all-green	3s
	38m 18s