Add story-style examples suite (29 stories + harness + CI) #2947

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	49s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.10, locked, ubuntu-latest)	57s
checks / test (3.10, locked, windows-latest)	1m 37s
checks / test (3.10, lowest-direct, windows-latest)	1m 51s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.11, lowest-direct, windows-latest)	1m 54s
checks / test (3.11, locked, windows-latest)	2m 3s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 12s
checks / test (3.11, locked, ubuntu-latest)	1m 4s
checks / test (3.12, locked, ubuntu-latest)	1m 23s
checks / test (3.12, locked, windows-latest)	1m 44s
checks / test (3.14, locked, ubuntu-latest)	2m 1s
checks / test (3.12, lowest-direct, windows-latest)	1m 37s
checks / test (3.14, lowest-direct, windows-latest)	1m 27s
checks / test (3.13, locked, ubuntu-latest)	58s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 2s
checks / test (3.13, locked, windows-latest)	1m 30s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.13, lowest-direct, windows-latest)	1m 47s
checks / test (3.14, locked, windows-latest)	2m 28s
all-green	5s
	30m 56s

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