Add story-style examples suite (27 stories + harness + CI) #2998

Job	Run time
checks / pre-commit	43s
checks / readme-snippets	12s
checks / test (3.10, lowest-direct, windows-latest)	2m 2s
checks / test (3.10, locked, ubuntu-latest)	44s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 11s
checks / test (3.11, lowest-direct, windows-latest)	2m 42s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.12, locked, ubuntu-latest)	1m 21s
checks / test (3.11, locked, ubuntu-latest)	1m 3s
checks / test (3.12, locked, windows-latest)	1m 42s
checks / test (3.14, lowest-direct, windows-latest)	1m 28s
checks / test (3.10, locked, windows-latest)	2m 23s
checks / test (3.12, lowest-direct, windows-latest)	2m 5s
checks / test (3.14, locked, windows-latest)	2m 34s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 2s
checks / test (3.11, locked, windows-latest)	1m 31s
checks / test (3.14, locked, ubuntu-latest)	2m 6s
checks / test (3.13, locked, windows-latest)	1m 49s
checks / test (3.13, lowest-direct, windows-latest)	1m 40s
checks / test (3.13, locked, ubuntu-latest)	59s
all-green	3s
	32m 39s

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