feat(continuous-did): discrete-treatment saturated regression (treatm… #2655

Job	Run time
Rust Unit Tests (ubuntu-latest)	1m 20s
Rust Unit Tests (windows-latest)	2m 38s
Pure Python Fallback	1h 11m 49s
Rust Unit Tests (macos-latest)	1m 46s
Rust Unit Tests (ubuntu-24.04-arm)	1m 27s
Python Tests (macos-latest, py3.14)	29m 48s
Python Tests (windows-latest, py3.11)	53m 58s
Python Tests (windows-latest, py3.14)	1h 1m 4s
Python Tests (ubuntu-24.04-arm, py3.11)	38m 0s
Python Tests (ubuntu-24.04-arm, py3.14)	34m 56s
Python Tests (ubuntu-latest, py3.13)	1h 5m 47s
Python Tests (windows-latest, py3.13)	1h 0m 1s
Python Tests (macos-latest, py3.13)	33m 57s
Python Tests (ubuntu-latest, py3.14)	1h 4m 48s
Python Tests (ubuntu-24.04-arm, py3.13)	35m 45s
Python Tests (macos-latest, py3.11)	30m 9s
Python Tests (ubuntu-latest, py3.11)	1h 5m 13s
	10h 52m 26s

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