Comprehensive data integrity audit for human review. - Detailed report with FAIL/WARN/INFO severity levels - Schema, lineage, dbt, and PostGIS validation - Actionable recommendations for each finding - Graceful degradation when components unavailable Use cases: sprint planning, code review, post-migration, periodic health checks, project onboarding. Closes #376 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>