Add survey_design support to WooldridgeDiD (Phase 10f) #873

Job	Run time
CI Gate	3s
Pure Python Fallback	1h 1m 32s
Python Tests (macos-latest, py3.11)	18m 8s
Rust Unit Tests (windows-latest)	2m 22s
Python Tests (ubuntu-24.04-arm, py3.11)	18m 59s
Rust Unit Tests (macos-latest)	1m 24s
Rust Unit Tests (ubuntu-latest)	1m 21s
Python Tests (macos-latest, py3.13)	18m 15s
Python Tests (windows-latest, py3.11)	37m 11s
Rust Unit Tests (ubuntu-24.04-arm)	2m 1s
Python Tests (ubuntu-latest, py3.11)	39m 19s
Python Tests (ubuntu-latest, py3.13)	45m 15s
Python Tests (ubuntu-24.04-arm, py3.13)	19m 36s
Python Tests (windows-latest, py3.13)	37m 2s
	5h 2m 28s

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