feat(had): cluster-robust event-study inference + clustered sup-t band #2629

Job	Run time
Rust Unit Tests (ubuntu-24.04-arm)	1m 30s
Rust Unit Tests (ubuntu-latest)	1m 20s
Rust Unit Tests (macos-latest)	1m 19s
Rust Unit Tests (windows-latest)	2m 21s
Pure Python Fallback	1h 11m 6s
Python Tests (macos-latest, py3.14)	34m 22s
Python Tests (macos-latest, py3.11)	33m 52s
Python Tests (ubuntu-latest, py3.13)	1h 4m 54s
Python Tests (ubuntu-latest, py3.11)	1h 9m 49s
Python Tests (macos-latest, py3.13)	28m 24s
Python Tests (ubuntu-24.04-arm, py3.11)	39m 30s
Python Tests (ubuntu-24.04-arm, py3.13)	35m 8s
Python Tests (windows-latest, py3.14)	1h 1m 50s
Python Tests (windows-latest, py3.13)	59m 31s
Python Tests (windows-latest, py3.11)	54m 41s
Python Tests (ubuntu-latest, py3.14)	1h 5m 6s
Python Tests (ubuntu-24.04-arm, py3.14)	35m 7s
	10h 59m 50s

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