- Remove foreign key on run_status.source_id to support sentinel rows
for tracking one-time pipeline steps (compile_candidates, compile_votes,
merge, compare)
- Add stage-3-enrich/config.ts with all provider configurations,
ALL_PROVIDERS ordered local-first, and validateProviderKey() for
startup key checks
- Add .env.example with required API keys for OpenRouter and Anthropic
- Add pipeline:run script to package.json using --env-file .env
- Add .env to root .gitignore coverage for data-pipeline/.env
