Add story-style examples suite (27 stories + harness + CI) #3039

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	43s
checks / test (3.11, locked, windows-latest)	1m 37s
checks / test (3.12, locked, ubuntu-latest)	1m 8s
checks / test (3.12, lowest-direct, ubuntu-latest)	59s
checks / test (3.13, lowest-direct, ubuntu-latest)	48s
checks / test (3.10, locked, windows-latest)	1m 21s
checks / test (3.11, lowest-direct, ubuntu-latest)	55s
checks / test (3.10, locked, ubuntu-latest)	57s
checks / test (3.10, lowest-direct, ubuntu-latest)	50s
checks / test (3.12, locked, windows-latest)	1m 20s
checks / test (3.11, locked, ubuntu-latest)	48s
checks / test (3.11, lowest-direct, windows-latest)	1m 36s
checks / test (3.13, locked, windows-latest)	1m 32s
checks / test (3.14, lowest-direct, windows-latest)	1m 30s
checks / test (3.13, locked, ubuntu-latest)	52s
checks / test (3.12, lowest-direct, windows-latest)	1m 35s
checks / test (3.14, locked, windows-latest)	2m 25s
checks / test (3.14, locked, ubuntu-latest)	1m 52s
checks / test (3.10, lowest-direct, windows-latest)	1m 33s
checks / test (3.14, lowest-direct, ubuntu-latest)	49s
checks / test (3.13, lowest-direct, windows-latest)	1m 38s
all-green	4s
	27m 4s

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