Package hygiene: metadata, CITATION, CI workflows, R CMD check fixes

[JohannesRahlf]

Summary

Package-hygiene pass — no change to model behaviour. Brings R CMD check --as-cran from 3 NOTEs down to 2 (the two remaining are the benign "New submission" and a local-only "pandoc not installed" note that disappears on CI).

DESCRIPTION

• Replace the placeholder Title: What the Package Does (Title Case) with a real title.
• Convert Author/Maintainer to Authors@R (clears the CRAN-incoming NOTE).
• Add URL and BugReports.
• Expand Description and cite the paper + correction DOIs.
• Drop LazyData: true (no-op here — coefficients live in internal R/sysdata.rda; the build already omitted it).

Code

• hfromd.R: use inherits(result, "try-error") instead of class(result) == "try-error" (clears the "comparing class() to string" NOTE; robust against R 4.x's length-2 class()).

Packaging / docs

• Add inst/CITATION (2023 paper + 2024 correction) so citation("taperNOR") works — verified it renders both entries.
• Add CI: .github/workflows/R-CMD-check.yaml (linux/macOS/windows, r-lib/actions) and .github/workflows/pytest.yaml (runs the python/ suite on 3.9/3.11/3.13).
• .Rbuildignore: exclude python/, .github/, .git/, .gitignore so they aren't bundled into the R source tarball (the python/ dir would otherwise trigger a top-level-files NOTE).
• Fix the LICENSE stub typo: taperNO authors → taperNOR authors.

Note on the GitHub license badge

GitHub currently shows the repo license as "Other". This is because GitHub's licensee keys on the bare LICENSE file, which — per the R/CRAN MIT + file LICENSE convention — is a 2-line stub (YEAR: / COPYRIGHT HOLDER:) that licensee can't match to MIT, even though LICENSE.md is full MIT. Making GitHub display "MIT" would require putting the full licence text in LICENSE, which costs 1–2 R CMD check NOTEs. I kept the CRAN-clean stub instead (verified: 0 license NOTEs). The package is unambiguously MIT-licensed via DESCRIPTION + LICENSE.md.

Test plan

• R CMD check --as-cran (R 4.6.0): OK, 2 NOTEs (New submission; pandoc-not-installed — both benign)
• testthat suite passes under the check (no test ERRORs)
• citation("taperNOR") renders both references
• CI workflows will run on this PR once merged-eligible (first run validates them)