Add story-style examples suite (29 stories + harness + CI) #2965

Job	Run time
checks / readme-snippets	12s
checks / test (3.14, locked, windows-latest)	2m 46s
checks / test (3.10, locked, ubuntu-latest)	1m 8s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.11, lowest-direct, windows-latest)	1m 42s
checks / test (3.13, locked, windows-latest)	1m 41s
checks / test (3.14, lowest-direct, windows-latest)	1m 35s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.11, locked, ubuntu-latest)	1m 3s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.13, locked, ubuntu-latest)	1m 5s
checks / test (3.10, locked, windows-latest)	1m 47s
checks / test (3.12, lowest-direct, windows-latest)	1m 38s
checks / test (3.12, locked, windows-latest)	1m 37s
checks / test (3.14, locked, ubuntu-latest)	2m 2s
checks / test (3.12, locked, ubuntu-latest)	1m 20s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.13, lowest-direct, windows-latest)	1m 49s
checks / test (3.10, lowest-direct, windows-latest)	1m 38s
checks / test (3.11, locked, windows-latest)	1m 28s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 1s
checks / pre-commit	49s
all-green	4s
	31m 3s

Provide feedback