EfficientDiD: cluster-robust SEs, last-cohort control, Hausman pretest, small cohort warning #522

Job	Run time
Pure Python Fallback	40m 26s
Rust Unit Tests (windows-latest)	2m 30s
Rust Unit Tests (macos-latest)	1m 9s
Rust Unit Tests (ubuntu-latest)	1m 20s
Rust Unit Tests (ubuntu-24.04-arm)	1m 26s
Python Tests (windows-latest, py3.11)	37m 46s
Python Tests (ubuntu-latest, py3.11)	39m 34s
Python Tests (ubuntu-24.04-arm, py3.13)	17m 34s
Python Tests (macos-latest, py3.11)	16m 47s
Python Tests (windows-latest, py3.13)	35m 29s
Python Tests (macos-latest, py3.13)	18m 31s
Python Tests (ubuntu-24.04-arm, py3.11)	17m 36s
Python Tests (ubuntu-latest, py3.13)	42m 37s
	4h 32m 45s

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