Test

docs: add AGENTS.md for AI-assisted development #7542

Job	Run time
py=3.12-min_deps	6m 47s
doctests	1m 0s
py=3.14-upstream	7m 57s
Benchmark smoke test	7m 54s
os=ubuntu-latest, py=3.12, deps=minimal	6m 30s
os=ubuntu-latest, py=3.13, deps=minimal	6m 14s
os=macos-latest, py=3.14, deps=optional	4m 6s
os=ubuntu-latest, py=3.13, deps=optional	8m 16s
os=macos-latest, py=3.12, deps=optional	7m 14s
os=windows-latest, py=3.12, deps=optional	10m 6s
os=ubuntu-latest, py=3.12, deps=optional	8m 7s
os=ubuntu-latest, py=3.14, deps=optional	4m 51s
os=windows-latest, py=3.14, deps=optional	6m 1s
os=ubuntu-latest, py=3.14, deps=minimal	3m 38s
Test complete	3s
	1h 28m 44s

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