Add story-style examples suite (27 stories + harness + CI) #2992

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	49s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.11, lowest-direct, windows-latest)	1m 58s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.14, locked, ubuntu-latest)	2m 5s
checks / test (3.13, locked, windows-latest)	1m 28s
checks / test (3.12, lowest-direct, windows-latest)	2m 20s
checks / test (3.11, locked, ubuntu-latest)	1m 8s
checks / test (3.13, locked, ubuntu-latest)	1m 2s
checks / test (3.14, lowest-direct, ubuntu-latest)	58s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 11s
checks / test (3.10, lowest-direct, windows-latest)	1m 36s
checks / test (3.14, locked, windows-latest)	2m 24s
checks / test (3.10, locked, ubuntu-latest)	1m 5s
checks / test (3.11, locked, windows-latest)	1m 30s
checks / test (3.14, lowest-direct, windows-latest)	1m 10s
checks / test (3.12, locked, windows-latest)	1m 46s
checks / test (3.13, lowest-direct, windows-latest)	1m 38s
checks / test (3.10, locked, windows-latest)	1m 33s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.12, locked, ubuntu-latest)	1m 19s
all-green	3s
	30m 33s

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