trialdiff 0.2.0

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 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 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.

trialdiff 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.