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This PR adds support for a Logit-Normal distribution to LightGBMLSS.
Summary
• Introduces a new LogitNormal distribution implemented as a transformed Normal with a sigmoid link
• Ensures correct support on (0, 1) via SigmoidTransform
• Integrates with the existing DistributionClass API
• Registers the distribution so it can be selected like other univariate continuous distributions
• Includes unit tests following the existing test structure
This PR is intentionally scoped to LogitNormal only, as discussed, and does not include unrelated refactors.