perf(linalg): opt-in solve_ols normal-equations Cholesky fast path (DIFF_DIFF_SOLVE_OLS_FASTPATH) #2934

Job	Run time
Rust Unit Tests (ubuntu-24.04-arm)	1m 36s
Rust Unit Tests (windows-latest)	2m 33s
Rust Unit Tests (macos-latest)	2m 2s
Rust Unit Tests (ubuntu-latest)	1m 21s
Pure Python Fallback	1h 9m 4s
Python Tests (macos-latest, py3.11)	36m 35s
Python Tests (ubuntu-latest, py3.13)	1h 0m 14s
Python Tests (macos-latest, py3.14)	33m 19s
Python Tests (ubuntu-latest, py3.11)	59m 42s
Python Tests (macos-latest, py3.13)	34m 14s
Python Tests (ubuntu-latest, py3.14)	1h 0m 40s
Python Tests (windows-latest, py3.11)	57m 6s
Python Tests (windows-latest, py3.14)	52m 20s
Python Tests (windows-latest, py3.13)	1h 3m 43s
Python Tests (ubuntu-24.04-arm, py3.11)	32m 13s
Python Tests (ubuntu-24.04-arm, py3.14)	31m 52s
Python Tests (ubuntu-24.04-arm, py3.13)	31m 52s
	10h 30m 26s

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