perf(linalg): scores-based CR2 Bell-McCaffrey DOF (algebraic identity; PT2018 §3.1 Satterthwaite) #2799

Job	Run time
Rust Unit Tests (ubuntu-latest)	1m 13s
Rust Unit Tests (ubuntu-24.04-arm)	1m 26s
Rust Unit Tests (macos-latest)	2m 1s
Python Tests (macos-latest, py3.14)	31m 37s
Rust Unit Tests (windows-latest)	2m 32s
Python Tests (windows-latest, py3.13)	56m 54s
Pure Python Fallback	1h 26m 26s
Python Tests (ubuntu-24.04-arm, py3.14)	30m 51s
Python Tests (windows-latest, py3.14)	58m 29s
Python Tests (windows-latest, py3.11)	56m 54s
Python Tests (ubuntu-latest, py3.14)	1h 0m 15s
Python Tests (ubuntu-24.04-arm, py3.11)	31m 8s
Python Tests (macos-latest, py3.11)	34m 27s
Python Tests (macos-latest, py3.13)	36m 18s
Python Tests (ubuntu-latest, py3.11)	1h 0m 3s
Python Tests (ubuntu-latest, py3.13)	59m 22s
Python Tests (ubuntu-24.04-arm, py3.13)	31m 2s
	10h 40m 58s

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