# ADR-0002 Authority matrix

## Context
Output fields need a single declared owner to prevent duplicate writers.

## Decision
Maintain a governance authority matrix and output-field owner ledger.

## Alternatives
- Embed ownership in ad hoc notes

## Consequences
- Ownership collision checks become explicit
- Review is easier for numeric outputs

## Rollback
Keep the prior ledger alongside the new one.

## Affected files
- governance/authority_matrix.yaml
- spec/03_formulas/output_field_owner_ledger.yaml