feat(continuous-did): covariate support (reg + dr) under conditional … #2642

Job	Run time
Pure Python Fallback	1h 25m 14s
Rust Unit Tests (windows-latest)	2m 15s
Rust Unit Tests (ubuntu-latest)	1m 13s
Rust Unit Tests (ubuntu-24.04-arm)	1m 25s
Rust Unit Tests (macos-latest)	1m 16s
Python Tests (windows-latest, py3.11)	54m 11s
Python Tests (ubuntu-24.04-arm, py3.14)	34m 42s
Python Tests (ubuntu-24.04-arm, py3.13)	35m 38s
Python Tests (windows-latest, py3.14)	1h 2m 11s
Python Tests (windows-latest, py3.13)	1h 0m 37s
Python Tests (macos-latest, py3.13)	32m 1s
Python Tests (ubuntu-latest, py3.14)	59m 55s
Python Tests (ubuntu-latest, py3.11)	1h 4m 20s
Python Tests (ubuntu-24.04-arm, py3.11)	37m 43s
Python Tests (macos-latest, py3.14)	30m 13s
Python Tests (macos-latest, py3.11)	28m 45s
Python Tests (ubuntu-latest, py3.13)	59m 8s
	10h 50m 47s

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