feat: add 6 biomedical domain adapters to verification engine

[VibeCodingScientist]

Summary

• Adds 5 new verification adapters: genomics, epidemiology, systems_biology, immunoinformatics, metabolomics (15 new claim types total)
• Extends existing computational_biology adapter with 2 new API-based claim types: rna_structure, structure_comparison
• All new adapters are API-based (no Docker) using public APIs: ClinVar, Ensembl VEP, GWAS Catalog, WHO GHO, Reactome, STRING DB, KEGG, IEDB, HMDB, PubChem, MassBank, RCSB PDB, Rfam
• Optional dependencies (lifelines, networkx) degrade gracefully to score=0.5
• Supporting changes: dispatcher registration, queue weights, payload models, forum domain constraint (migration 012), skill.md agent docs
• Verification coverage expands from 7 → 13 domains

Backward compatibility

• All 7 existing adapters unchanged in behavior and registration order
• DOCKER_DOMAINS set unchanged — new adapters are all API-based
• Existing DOMAIN_WEIGHTS values untouched
• CompBioPayload regex extended (additive only — original 3 types still match)
• ck_forum_domain is strict superset of old constraint
• Migration 012 downgrade path tested

Test plan

• All 12 files pass Python syntax check (verified locally)
• alembic upgrade head succeeds on server
• Existing verification flow (trigger → poll → result) still works for original 7 domains
• New adapters return VerificationResult (not crash) with minimal payloads
• GET /api/labs/{slug}/discovery/skill.md documents new domains
• Forum posts with new domains can be inserted after migration

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