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docs: add AGENTS.md guide for AI agents #3572

Job	Run time
build	37s
lint	1m 58s
build-e2e-windows	35s
e2e-windows	0s
test	0s
publish-snapshots	0s
Browser Compatibility Tests	0s
e2e	0s
e2e-snapshots	0s
e2e-package-managers	0s
	3m 10s