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

---

PERSISTENCE & RESUME PROTOCOL

Before starting work:
1. Read /refactor-backlog/_status.md. If your row says "complete", stop — do not re-run.
2. If "in_progress", read your own output file. Treat modules already listed as done.
   Resume from "Last module processed" + 1.
3. If "not_started", confirm your dependencies show "complete" in _status.md. If not,
   stop and report a blocking dependency instead of guessing.

While working:
4. Append findings incrementally, one module at a time. After each module, update
   _status.md: "Last module processed" and "Last updated".
5. Each finding gets a stable ID (e.g. RD-014) that never changes across runs.
6. If interrupted, the file + status row is the full recovery state.

On completion:
7. Mark your _status.md row "complete" only once every module in scope has a
   corresponding section in your output file.

Every output file starts with:
## Scope: [modules covered]
## Status: [not_started | in_progress | complete]
## Last updated: [timestamp]
## Depends on: [file(s)]
## ---

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.