Add story-style examples suite (29 stories + harness + CI) #2948

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	44s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 14s
checks / test (3.10, locked, windows-latest)	1m 43s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.12, locked, ubuntu-latest)	1m 20s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.10, lowest-direct, windows-latest)	1m 32s
checks / test (3.12, lowest-direct, windows-latest)	1m 29s
checks / test (3.11, locked, ubuntu-latest)	1m 5s
checks / test (3.11, lowest-direct, windows-latest)	1m 47s
checks / test (3.12, locked, windows-latest)	1m 22s
checks / test (3.13, locked, ubuntu-latest)	52s
checks / test (3.13, locked, windows-latest)	1m 17s
checks / test (3.11, locked, windows-latest)	1m 31s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.10, locked, ubuntu-latest)	1m 8s
checks / test (3.13, lowest-direct, windows-latest)	1m 50s
checks / test (3.14, locked, ubuntu-latest)	2m 3s
checks / test (3.14, locked, windows-latest)	2m 22s
checks / test (3.14, lowest-direct, windows-latest)	1m 50s
checks / test (3.14, lowest-direct, ubuntu-latest)	59s
all-green	4s
	29m 46s

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