Release contentvalidR 0.10.0

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Stamps the version, release notes, citation metadata, README, and roadmap for contentvalidR 0.10.0, the tenth public release and the last planned before the joint 1.0 release candidate on 2026-10-17.

What 0.10.0 carries

• Figures for papers, posters, and teaching (Add figures for papers, posters, and teaching: content_evidence() and the distribution view #82):
  • content_evidence(), with its item flow diagram (modeled on PRISMA 2020) and its item evidence profile;
  • the rating-distribution view for relevance panels and Delphi studies (diverging stacked bars);
  • the apa switch between gray and a colorblind-safe color scheme.
• The handoff contract stated for readers (State the handoff reader contract nomologR asked for, and record the joint 1.0 checklist #79): decisions come from carried and status, and an item sits in at most one scale.
• The joint walkthrough lives here (Host the joint walkthrough here, and hand nomologR the whole handoff #80, Link the walkthrough to nomologR's companion article on the same data #81). It passes nomologR the whole handoff and links nomologR's companion article on the same data.
• Finishing touches (Pre-1.0 polish: Delphi caveats apart from the key, anova in 80 columns, the site menu, and Scheibe's 2002 edition #78): the Delphi printout's caveats are separated from its teaching, anova_content() fits in 80 columns, the site menu lists every guide, and Scheibe et al. are cited from the 2002 edition.
• The release-candidate timeline and CRAN-first installation (Set 2026-10-17 as release-candidate day, and install from CRAN first #83).

Checks

• No computed value changes. The value battery (25 analyses across every workflow) was run from the v0.9.0 tag and from master at 67425b6: 0 differences, and no columns added or removed.
• No breaking changes. The plot methods gain arguments after their existing ones. agreement_summary() remains deprecated and is removed in 1.0.0.
• All 3,060 tests pass, and spelling is clean.
• tools/release-gate.R on this PR's head (9eda3be), run in a detached worktree: build, smoke, and check all pass on the 0.10.0 tarball. R CMD check: 0 errors, 0 warnings, and only the two expected notes (CRAN incoming feasibility, "Days since last update"; math rendering skipped without V8).

Stamps

• DESCRIPTION becomes 0.10.0. CITATION.cff becomes 0.10.0, released 2026-09-28.
• The README's current release line is updated.
• NEWS gets its release heading and summary, and the ROADMAP gets a v0.10.0 section.

After merge

• Tag v0.10.0 (annotated) on the merge commit and publish the GitHub release. R-universe builds from it.
• Not submitted to CRAN. 0.4.0 has been on CRAN since 2026-09-28, and CRAN asks for updates no more often than every one to two months. The next CRAN submission is the joint 1.0.

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