fix: default S3 methods for the classic rfsrc/randomForest wrappers (3.4.1)

[ehrlinger]

Post-release consistency pass

Finishes the dispatch cleanup started for the varPro family in 3.4.0 (#136). The five classic wrappers — gg_error(), gg_vimp(), gg_variable(), gg_rfsrc(), gg_brier() — had no default S3 method, so a wrong-class input got R's generic no applicable method for '...' error.

Add default methods emitting a clear, class-naming error:
"gg_error: expected an 'rfsrc' or 'randomForest' object; got an object of class <...>."

gg_roc() intentionally left as-is — its default is aliased to gg_roc.rfsrc (gg_roc.default <- gg_roc.rfsrc), so it accepts rfsrc-shaped objects. Changing that is a behavior change, not a mechanical add, so it's out of scope.

Safety

Purely additive — no change to valid-input behavior. Existing wrapper tests all pass (gg_error 58 / gg_vimp 61 / gg_variable 85 / gg_rfsrc 67 / gg_brier 14, FAIL 0). New fit-free test_default_dispatch.R asserts all five error paths + the class-name interpolation; it runs on CRAN (no model fit needed).

Version — your call

Patch bump to 3.4.1 (DESCRIPTION + NEWS; grep test matches). This starts the post-3.4.0 dev line on main and will not be submitted immediately (CRAN discourages back-to-back updates). If you'd rather hold main at 3.4.0 and accumulate more before opening 3.4.1, say so and I'll drop the version bump.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.29%. Comparing base (89a10d7) to head (a9c0738).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #139      +/-   ##
==========================================
+ Coverage   88.25%   88.29%   +0.04%     
==========================================
  Files          48       48              
  Lines        4360     4375      +15     
==========================================
+ Hits         3848     3863      +15     
  Misses        512      512              

Files with missing lines	Coverage Δ
R/gg_brier.R	89.74% <100.00%> (+0.41%)	⬆️
R/gg_error.R	89.88% <100.00%> (+0.18%)	⬆️
R/gg_rfsrc.R	76.54% <100.00%> (+0.29%)	⬆️
R/gg_variable.R	85.85% <100.00%> (+0.44%)	⬆️
R/gg_vimp.R	76.76% <100.00%> (+0.35%)	⬆️

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[Copilot]

Pull request overview

Adds missing .default S3 methods for the package’s classic rfsrc/randomForest wrapper generics so that wrong-class inputs fail with a consistent, explicit error message (instead of R’s generic “no applicable method…”), and adds fit-free tests to lock in this behavior.

Changes:

• Add gg_error.default(), gg_vimp.default(), gg_variable.default(), gg_rfsrc.default(), and gg_brier.default() with clear class-reporting stop() messages.
• Add a new fit-free test (test_default_dispatch.R) that asserts these default-dispatch error paths and class interpolation.
• Bump package version and NEWS to 3.4.1 to reflect the dispatch-consistency change.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/testthat/test_default_dispatch.R	Adds fit-free tests ensuring wrong-class inputs hit new .default methods with clear messages.
R/gg_error.R	Adds gg_error.default() to provide a consistent wrong-class error.
R/gg_vimp.R	Adds gg_vimp.default() to provide a consistent wrong-class error.
R/gg_variable.R	Adds gg_variable.default() to provide a consistent wrong-class error.
R/gg_rfsrc.R	Adds gg_rfsrc.default() to provide a consistent wrong-class error.
R/gg_brier.R	Adds gg_brier.default() to provide a clearer wrong-class error specific to survival rfsrc.
NAMESPACE	Registers the new S3method(*, default) entries.
NEWS.md	Documents the dispatch-consistency change under v3.4.1.
DESCRIPTION	Bumps Version/Date to 3.4.1 / 2026-07-02.

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