v0.4.2

What's New

• validate(df, meta) — check value label quality before analysis
  • Unlabeled values (error) — data values without labels in metadata
  • Duplicate labels (warning) — multiple codes mapping to the same label
  • ValidationReport with is_valid, errors, warnings, raise_if_invalid(), to_frame()
  • Repr truncation: max 10 issues, 80-char box width
• Shared pure helpers between validate() and apply_labels() — same check logic, different behavior (report vs raise)
• columns + exclude combinable in validate() for flexible filtering
• 29 new tests

See validate.md for full documentation.

Full Changelog: v0.4.1...v0.4.2