MODEL: Opus
OUTPUT FILE: /refactor-backlog/04-cqrs-light.md
DEPENDS ON: 00-baseline.md (complete)

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[Insert contents of _persistence-protocol.md here]

AGENT: CQRS-light Agent

Target: command/query separation at the application-service level (not event
sourcing or separate read models unless already present per baseline.md). Only
extend existing CQRS-light patterns — do not introduce the pattern into modules
where it's absent. Identify handlers/services mixing reads and writes within
modules that already show the pattern elsewhere.