Changes in version 0.2.0 (2026-09-27)                  

  - Added an analysis/output registry: td_output() and output_registry()
    declare analyses and outputs and their inputs, and add_outputs(),
    add_edges() and remove_edges() graft, extend or override a lineage
    graph.
  - Added lineage_from_metadata(), which derives a lineage graph from a
    \pkg{metacore} object (or equivalent metadata tables), with
    provenance and a review list for ambiguous or unparsed references.
    aliases resolve tokens that would otherwise be ambiguous or unknown,
    and overrides merge an analysis/output registry into the generated
    graph.
  - Added a "diffdf" comparison backend to compare_cut(), which
    delegates value comparison to the \pkg{diffdf} package and
    translates its output into a tdiff object (schema comparison remains
    built in).
  - Added a case-study vignette using public pharmaverseadam data.
  - as_register() now coerces key columns to character, fixing a failure
    when key columns were not character.
  - New records in visit-based datasets are classified as new_visit
    rather than new_assessment.
  - Added edge-case tests; package coverage now exceeds 90%.
  - Bumped GitHub Actions and added Codecov configuration.

                        Changes in version 0.1.0                        

  - First tagged release. Five composable layers: compare, classify,
    trace, assess and report.
  - compare_cut() compares two data cuts of a clinical dataset and
    reports added, removed and modified observations plus schema
    changes.
  - classify_changes() applies transparent, prioritised rules to produce
    a clinical change taxonomy.
  - define_lineage() and trace_dependencies() build and query a lineage
    graph.
  - assess_impact() grades downstream impact as
    definitely/potentially/unlikely.
  - report_diff() produces HTML, Quarto, JSON and list reports.
  - Synthetic ADSL/ADLB data cuts and an example lineage are included.

                     Changes in version 0.0.0.9000                      

  - Initial development version.