Add story-style examples suite (29 stories + harness + CI) #3000

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	45s
checks / test (3.14, locked, ubuntu-latest)	2m 6s
checks / test (3.10, locked, ubuntu-latest)	56s
checks / test (3.11, lowest-direct, windows-latest)	1m 41s
checks / test (3.14, lowest-direct, windows-latest)	1m 34s
checks / test (3.13, lowest-direct, windows-latest)	1m 37s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.12, lowest-direct, windows-latest)	1m 50s
checks / test (3.11, locked, windows-latest)	1m 36s
checks / test (3.10, locked, windows-latest)	1m 37s
checks / test (3.13, locked, ubuntu-latest)	1m 1s
checks / test (3.10, lowest-direct, windows-latest)	1m 27s
checks / test (3.12, locked, ubuntu-latest)	1m 21s
checks / test (3.14, lowest-direct, ubuntu-latest)	58s
checks / test (3.12, locked, windows-latest)	1m 44s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.13, locked, windows-latest)	1m 26s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.14, locked, windows-latest)	2m 29s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.11, locked, ubuntu-latest)	1m 2s
all-green	5s
	29m 50s

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