Resolve remaining R CMD check warnings and notes

[jimianelli]

Context

After adding the annex plotting helpers, a source-tarball check runs to completion but still reports existing package hygiene warnings and notes.

Command used:

R CMD build --no-build-vignettes --no-manual .
R CMD check --no-manual --no-build-vignettes jjmR_1.2020.1.tar.gz

Current check status

R CMD check completes with 3 WARNINGs and 3 NOTEs.

Key groups:

• Non-ASCII characters in R/jjm.diag-internal.R.
• summary.jjm.diagnostics() has an S3 method signature mismatch: summary() expects function(object, ...), but the method currently uses function(x, ...).
• Several Rd files have undocumented usage arguments, including changeNameModel, compareModels, getter, kobe, plot.jjm.diagnostics, plot_selectivities, runit, and summary.jjm.diagnostics.
• man/dot-getJjmConfig.Rd reports a lost-braces warning around an escaped code tag.
• Code-analysis notes remain for tidy-eval/global-variable bindings and a few missing namespace imports.
• doSNOW and pander are listed in Imports but are not detected as used.

Suggested repair sequence

1. Apply low-risk syntax/Rd fixes first: ASCII comments/strings, S3 method signature, missing Rd arguments, and the escaped Rd code tag.
2. Add missing namespace imports or utils::globalVariables() declarations for tidy-eval symbols.
3. Decide whether unused imports should stay because they are used indirectly by reports/examples, or move/remove them.
4. Rerun source-tarball check and keep residual notes explicit.

Acceptance criteria

• Source tarball builds.
• Package installs.
• R CMD check --no-manual --no-build-vignettes has fewer warnings/notes, with any remaining items documented.

[jimianelli]

Local repair set has been applied in the working tree and verified with:\n\n- R CMD INSTALL --no-multiarch --with-keep.source .\n- Synthetic annex extractor/plot smoke test\n- quarto inspect inst/examples/annex_plots_example.qmd\n- R CMD build --no-build-vignettes --no-manual /Users/jim/_mymods/sprfmo/jjmr\n- R CMD check --no-manual --no-build-vignettes /tmp/jjmR_1.2020.1.tar.gz\n\nThe latest check result is Status: OK. The issue should stay open until these working-tree changes are committed/PR'd.