R2 adjustments - documentation and glmmTMB defaults

[strengejacke]

Fixes #928

[Copilot]

Pull request overview

This PR addresses issue #928 by correcting the r2() documentation (“generalized” vs “general” linear models) and revising the r2.glmmTMB() defaults for non-mixed glmmTMB models, with added test coverage for additional glmmTMB families.

Changes:

• Update r2() documentation to refer to “Generalized linear models” (GLMs) for Nagelkerke’s R2.
• Refactor r2.glmmTMB() non-mixed handling to select R2 method based on glmmTMB family and default to McFadden’s R2 for otherwise-unhandled families.
• Extend tests for non-mixed glmmTMB models to include compois and genpois, and bump the development version.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
R/r2.R	Refactors r2.glmmTMB() routing logic and updates docs text in roxygen header.
tests/testthat/test-r2.R	Adds/adjusts non-mixed glmmTMB test cases (including compois/genpois).
man/r2.Rd	Regenerates docs to match the “Generalized linear models” correction.
DESCRIPTION	Bumps package version to reflect user-visible behavioral changes.

Files not reviewed (1)

• man/r2.Rd: Generated file

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