feat: techspec additions — de novo tier-6 branch, structure export, page capture + final synthesis

fix: NGS pipeline stuck in queued - worker fallback + migration fix

feat: add full 6-step NGS pipeline + fix sequencing WinError 193

Phase 0c: offload large artifacts to Supabase Storage (docking, pipeline, sequencing)

Phase 0b: durable worker with FOR UPDATE SKIP LOCKED, per-type concurrency, separate container

Phase 0a: SSRF protection + auth on docking/sequencing, worker design doc

Docking: minimal INSERT (only id/status/smiles), startup table check, migration SQL