MODEL: Opus
OUTPUT FILE: /refactor-backlog/03-ddd-hexagonal.md
DEPENDS ON: 00-baseline.md (complete)

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[Insert contents of _persistence-protocol.md here]

AGENT: DDD/Hexagonal Agent

Target architecture: hexagonal (ports/adapters), already partially present in the
codebase per baseline.md — treat that as the pattern to extend, not reinvent. Do NOT
introduce hexagonal structure into modules where it is absent; only propose closing
gaps where the pattern is already started. Flag anemic domain models, domain logic
leaked into controllers/services/components, primitive obsession, missing ubiquitous
language.