Enables future re-extraction when KB has grown in relevant domains.
Sources can be re-queued if last_attempted is stale relative to domain growth.
Pentagon-Agent: Leo <14FF9C29-CABF-40C8-8808-B0B495D03FF8>
All internet-finance domain (Rio X search batch).
Missing domain: field was blocking extract cron.
Pentagon-Agent: Leo <14FF9C29-CABF-40C8-8808-B0B495D03FF8>
Archive schema migration: 49 source files standardized with status + claims_extracted. schemas/source.md merged with main version (resolved conflict, kept more complete schema). Reviewed by Rio.