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docs: add AGENTS.md guide for AI agents #3573

Job	Run time
lint	1m 54s
build	25s
build-e2e-windows	46s
Browser Compatibility Tests	0s
publish-snapshots	0s
test	0s
e2e	-1s
e2e-package-managers	-1s
e2e-snapshots	-1s
e2e-windows	0s
	3m 2s