Release contentvalidR 0.3.0

[JUhalt]

Summary

Release candidate for contentvalidR 0.3.0. All three v0.3 method workstreams are merged: selectable score intervals (#17, via #21), panel-level agreement (#18, via #22), and evidence-based factor retention (#19, via #23). This PR stamps the release and prepares the CRAN submission tracked in #14.

Per the distribution decision, the GitHub release comes first and everything else follows: R-universe builds from the tag, and the CRAN submission is made from the same tarball after merge.

Version and metadata

• DESCRIPTION stamped to 0.3.0. The Description field now gives <doi:...> links for every method it cites, which CRAN reviewers routinely request, and names the v0.3 additions and the selectable-methods design.
• CITATION.cff stamped to 0.3.0 with a release date; inst/CITATION reads the version from DESCRIPTION.
• License: GPL-3 with the unmodified GPLv3 text, and inst/NOTICE preserving the historical MIT attribution for v0.1.0. LICENSE.md stays build-ignored.

NEWS

Consolidates the three development sections into a single # contentvalidR 0.3.0 entry, with an introduction that names the design rule and states plainly the two defaults that change results for existing code.

README

• Stable release line updated to 0.3.0, and the planning link now points at the Future research milestone instead of the finished v0.3.0 milestone.
• Expert-panel summary names the score intervals and panel-level agreement.
• The license paragraph still said the next release would carry GPLv3; v0.2.0 already did. Corrected.

CRAN

• cran-comments.md records the actual check results and distinguishes contentvalidR from the CRAN package contentValidity (version 0.2.0, published 2026-06-03).
• Every help page now has runnable examples. The clean-library smoke test found five without them: agreement_summary() (now guarded by requireNamespace("irr"), since irr is only suggested) and the plot() methods for sort, rating, expert, and sort-power objects. CRAN reviewers routinely ask for examples on exported functions. All 39 pages already had a \value section.

Verification

Gate	Result
R CMD check --as-cran on the built 0.3.0 tarball, with CRAN incoming checks	0 errors, 0 warnings, 3 notes: "New submission", plus two from the local Windows machine (V8 not installed; MiKTeX's lastMiKTeXException temp file), each explained in cran-comments.md
Tarball contents	168 files; inst/NOTICE present, no LICENSE file, no build-ignored files
Clean-library install of built tarball	examples for all 39 help topics, all 7 vignettes, and the citation run with only base R and the tarball on the library path
Spelling	clean
URLs and DOIs	all resolve

Roadmap

Marks v0.3.0 as a release candidate and adds its exit gate.

Test plan

• --as-cran on the built 0.3.0 tarball: 0 errors, 0 warnings, notes explained
• Clean-library install and smoke tests
• Every help page has runnable examples, and all examples run
• URL and DOI audit clean
• Spelling clean
• Version consistent across DESCRIPTION, CITATION.cff, NEWS, README
• CI green across the OS/R matrix
• Tag v0.3.0 and publish the GitHub release after merge
• Verify the R-universe build picks up 0.3.0
• Submit to CRAN ([v0.3] Submit contentvalidR to CRAN #14)

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