Add basic assumptions to AGENTS.md #9175

Job	Run time
integration-test-adls	1m 34s
integration-test	4m 5s
integration-test-s3	1m 8s
cibw-dev-env-smoke-test	34s
lint-and-unit-test (3.13)	1m 2s
integration-test-gcs	1m 11s
lint-and-unit-test (3.12)	1m 1s
lint-and-unit-test (3.11)	1m 0s
lint-and-unit-test (3.14)	1m 10s
lint-and-unit-test (3.10)	57s
integration-coverage-report	1s
	13m 43s

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