Changes in version 0.1.3 (2026-01-13)                  

Major changes

  - Clarified and standardized emission units across the package. All
    emission calculation functions now consistently return annual
    emissions expressed as kg CO2eq yr-1 (farm-level totals). This
    applies to:
    
      - calc_emissions_enteric()
      - calc_emissions_manure()
      - calc_emissions_soil()
      - calc_emissions_energy()
      - calc_emissions_inputs()
      - aggregated results from calc_total_emissions()

  - Updated returned objects and documentation to ensure that temporal
    definitions of emission units are explicit and unambiguous,
    addressing reviewer feedback.

Documentation

  - Updated the README to explicitly state that absolute emissions are
    reported as annual values (kg CO2eq yr-1), and that intensity
    metrics are derived from annual data.
  - Updated the Get started and IPCC Methodology Tiers vignettes to
    clarify:
      - system boundaries,
      - unit definitions,
      - aggregation logic.
  - Improved function documentation (@return sections) for clarity and
    consistency.

Internal structure

  - Refactored helper logic for purchased inputs into a dedicated helper
    file (inputs_helpers.R) to improve modularity and testability.
  - Improved internal consistency of boundary handling across emission
    modules.

Tests

  - Extended and updated unit tests to reflect clarified unit
    conventions.
  - Ensured integration tests cover full farm-level workflows using
    annual emissions.

Minor improvements

  - Improved error messages and validation for emission factor inputs.
  - Minor code clean-up and formatting improvements.