Add story-style examples suite (27 stories + harness + CI) #3041

Job	Run time
checks / pre-commit	44s
checks / readme-snippets	14s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.10, locked, ubuntu-latest)	1m 2s
checks / test (3.10, locked, windows-latest)	1m 37s
checks / test (3.11, lowest-direct, windows-latest)	1m 35s
checks / test (3.13, locked, ubuntu-latest)	54s
checks / test (3.12, lowest-direct, windows-latest)	1m 56s
checks / test (3.11, locked, ubuntu-latest)	1m 7s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.14, lowest-direct, windows-latest)	1m 32s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.14, locked, ubuntu-latest)	1m 56s
checks / test (3.12, locked, ubuntu-latest)	1m 23s
checks / test (3.13, lowest-direct, windows-latest)	1m 29s
checks / test (3.12, locked, windows-latest)	1m 36s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.11, locked, windows-latest)	1m 31s
checks / test (3.13, locked, windows-latest)	1m 30s
checks / test (3.14, locked, windows-latest)	2m 42s
checks / test (3.10, lowest-direct, windows-latest)	1m 50s
all-green	5s
	30m 20s

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