Add story-style examples suite (29 stories + harness + CI) #2944

Job	Run time
checks / readme-snippets	13s
checks / pre-commit	40s
checks / test (3.10, lowest-direct, windows-latest)	1m 36s
checks / test (3.11, lowest-direct, ubuntu-latest)	56s
checks / test (3.11, locked, ubuntu-latest)	54s
checks / test (3.13, locked, ubuntu-latest)	58s
checks / test (3.11, lowest-direct, windows-latest)	1m 35s
checks / test (3.10, locked, windows-latest)	1m 44s
checks / test (3.13, lowest-direct, windows-latest)	1m 32s
checks / test (3.14, locked, ubuntu-latest)	2m 11s
checks / test (3.14, locked, windows-latest)	2m 39s
checks / test (3.12, lowest-direct, windows-latest)	1m 36s
checks / test (3.10, lowest-direct, ubuntu-latest)	49s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.13, locked, windows-latest)	1m 33s
checks / test (3.12, locked, ubuntu-latest)	1m 24s
checks / test (3.11, locked, windows-latest)	1m 22s
checks / test (3.10, locked, ubuntu-latest)	1m 0s
checks / test (3.14, lowest-direct, windows-latest)	1m 25s
checks / test (3.12, locked, windows-latest)	1m 53s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 13s
all-green	2s
	29m 22s

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