Add fingerprintOPT, fingerprintNLS, and lwRegcov.lam#9
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Implements Li, Chen & Yan (2025, J. Climate) regularized TLS fingerprinting (fingerprintOPT) and nonlinear shrinkage fingerprinting (fingerprintNLS) from arXiv:2505.04070. Adds scalar Ledoit-Wolf shrinkage intensity lwRegcov.lam() as a companion to the existing lwRegcov(). Includes RMT-corrected asymptotic variance, joint detection confidence regions, and roxygen documentation.
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Implements Li, Chen & Yan (2025, J. Climate) regularized TLS fingerprinting
(fingerprintOPT) and nonlinear shrinkage fingerprinting (fingerprintNLS) from
arXiv:2505.04070. Adds scalar Ledoit-Wolf shrinkage intensity lwRegcov.lam()
as a companion to the existing lwRegcov(). Includes RMT-corrected asymptotic
variance, joint detection confidence regions, and roxygen documentation.