Add story-style examples suite (29 stories + harness + CI) #2946

Job	Run time
checks / pre-commit	48s
checks / readme-snippets	12s
checks / test (3.11, locked, ubuntu-latest)	1m 2s
checks / test (3.11, lowest-direct, windows-latest)	2m 3s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.14, lowest-direct, ubuntu-latest)	58s
checks / test (3.14, lowest-direct, windows-latest)	1m 33s
checks / test (3.10, locked, windows-latest)	1m 45s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 10s
checks / test (3.10, lowest-direct, windows-latest)	2m 8s
checks / test (3.12, locked, ubuntu-latest)	1m 17s
checks / test (3.13, locked, windows-latest)	1m 32s
checks / test (3.10, locked, ubuntu-latest)	1m 1s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.13, lowest-direct, windows-latest)	1m 57s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 14s
checks / test (3.12, lowest-direct, windows-latest)	1m 51s
checks / test (3.13, locked, ubuntu-latest)	1m 0s
checks / test (3.11, locked, windows-latest)	1m 41s
checks / test (3.14, locked, ubuntu-latest)	2m 8s
checks / test (3.12, locked, windows-latest)	1m 35s
checks / test (3.14, locked, windows-latest)	2m 22s
all-green	4s
	31m 29s

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