MODEL: Opus
OUTPUT FILE: /refactor-backlog/02-testability.md
DEPENDS ON: 00-baseline.md (complete)

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[Insert contents of _persistence-protocol.md here]

AGENT: Testability Agent

Flag constructs that block unit testing without excessive mocking: static/singleton
dependencies, hidden I/O, constructors doing work, mixed pure/impure logic. Cite
baseline coverage gap per finding. Propose the minimal seam needed (interface
extraction, pure function split) — not a rewrite.