Add story-style examples suite (27 stories + harness + CI) #3044

Job	Run time
checks / pre-commit	43s
checks / readme-snippets	11s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.10, locked, windows-latest)	1m 53s
checks / test (3.10, lowest-direct, windows-latest)	1m 36s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.10, locked, ubuntu-latest)	1m 8s
checks / test (3.11, lowest-direct, windows-latest)	1m 36s
checks / test (3.11, locked, windows-latest)	1m 29s
checks / test (3.11, locked, ubuntu-latest)	1m 3s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 11s
checks / test (3.12, locked, ubuntu-latest)	1m 17s
checks / test (3.12, lowest-direct, windows-latest)	1m 35s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.13, locked, ubuntu-latest)	54s
checks / test (3.13, locked, windows-latest)	1m 24s
checks / test (3.12, locked, windows-latest)	1m 45s
checks / test (3.14, locked, ubuntu-latest)	1m 57s
checks / test (3.14, lowest-direct, ubuntu-latest)	57s
checks / test (3.14, lowest-direct, windows-latest)	1m 43s
checks / test (3.13, lowest-direct, windows-latest)	1m 21s
checks / test (3.14, locked, windows-latest)	2m 48s
all-green	5s
	29m 51s

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