Remove stale dirs/files superseded by metabuilder-small's reorganization:
- Old YAML entity/seed files (migrated to JSON)
- Root-level workflowui/ (moved to frontends/workflowui/)
- Prisma, Pyodide, old hooks, bun.lock artifacts
- Legacy scratch docs (txt/, docs/, deployment/*.md)
- Stale CI workflows consolidated in small
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
