Add basic assumptions to AGENTS.md #9154

Job	Run time
integration-test-adls	1m 23s
integration-test	11m 46s
integration-test-s3	1m 15s
integration-test-gcs	1m 15s
lint-and-unit-test (3.14)	2m 40s
lint-and-unit-test (3.12)	3m 14s
lint-and-unit-test (3.13)	3m 8s
lint-and-unit-test (3.10)	3m 22s
lint-and-unit-test (3.11)	3m 17s
cibw-dev-env-smoke-test	25s
integration-coverage-report	27s
	32m 12s

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