Add story-style examples suite (29 stories + harness + CI) #2945

Job	Run time
checks / readme-snippets	15s
checks / pre-commit	49s
checks / test (3.11, lowest-direct, windows-latest)	1m 41s
checks / test (3.10, locked, windows-latest)	1m 35s
checks / test (3.10, lowest-direct, windows-latest)	1m 42s
checks / test (3.14, locked, windows-latest)	2m 31s
checks / test (3.12, lowest-direct, windows-latest)	1m 29s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.10, lowest-direct, ubuntu-latest)	50s
checks / test (3.12, locked, windows-latest)	1m 34s
checks / test (3.13, locked, windows-latest)	1m 40s
checks / test (3.11, lowest-direct, ubuntu-latest)	52s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.10, locked, ubuntu-latest)	58s
checks / test (3.12, locked, ubuntu-latest)	1m 17s
checks / test (3.11, locked, ubuntu-latest)	51s
checks / test (3.14, lowest-direct, ubuntu-latest)	56s
checks / test (3.13, lowest-direct, windows-latest)	1m 48s
checks / test (3.13, locked, ubuntu-latest)	58s
checks / test (3.14, lowest-direct, windows-latest)	1m 26s
checks / test (3.14, locked, ubuntu-latest)	2m 3s
checks / test (3.11, locked, windows-latest)	1m 26s
all-green	2s
	29m 2s

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