Add review-communities skill for comprehensive QA validation

Provides systematic quality assurance for ontology-mapped communities:
- Schema validation via LinkML
- Ontology term verification via OAK
- Evidence reference validation (PMID/DOI snippets)
- Network integrity auditing
- Growth media linkage validation
- Completeness and quality scoring

Integrated with existing just commands (qc, validate-*, audit-network).
Supports interactive Claude-assisted review and batch validation.

Based on MediaIngredientMech review-ingredients skill pattern.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: realmarcin