chore: finalize v0.4.3 JOSS-ready release documentation

[AurelienNicosiaULaval]

Summary

This PR finalizes JOSS-ready release documentation and metadata for v0.4.3.

Changes

• Bumps package version to 0.4.3:
  • DESCRIPTION, CITATION.cff, codemeta.json
• Adds JOSS submission guide and reproducibility bundle:
  • docs/joss_submission_guide.md
  • docs/joss_release_bundle.md
• Updates review/release checklist:
  • docs/release_checklist.md
• Refreshes README reviewer-facing reproducibility section.
• Finalizes manuscript support for JOSS:
  • paper/paper.md (state of the art, AI disclosure, limitations)
• Updates:
  • NEWS.md
  • cran-comments.md
• Adds and updates finalization metadata for tag/release traceability.

Validation

• lintr::lint_package()
• devtools::test() (98 tests pass)
• R CMD build .
• R CMD check --as-cran --no-manual tutorizeR_0.4.3.tar.gz (OK, 0 ERROR, 0 WARNING, 1 NOTE: New submission)
• Smoke conversion + render on fixtures, including with_mcq_ref with local bank

Tag

• v0.4.3 points to this release state