Solution: NODE_SCHEMA with node_type='error'. Fields: error_type, related_principle_id, context, outcome, severity. Embeds on error description for similarity search.
v3 2026-04-05 Q Mapped to whitepaper sections
v2 2026-04-05 Q Imported SPEC-005 from model_specifications_v2.html
v1 2026-04-05 Q Created spec: SPEC-005: Error Bank Schema