# Step 2: resume-state

## Read First
- /AGENTS.md
- /PLAN.md
- /PROGRESS.md
- /docs/HARNESS.md
- /docs/IMPLEMENTATION_PLAN.md
- /docs/CONVERSION_POLICY.md
- /phases/6-cli-runtime-resume/step1.md

## Task
Implement runtime resume state for successful and failed chunks.

Resume state is a runtime artifact, not a document output sidecar.

## Sprint Contract
- Done means: conversion can skip completed chunks and retry failed chunks using a local state file in tests.
- Hard thresholds: state format is deterministic; stale state is detected; resume does not skip chunks when input/options changed materially.
- Files owned: `src/pdftomd/resume.py`, runtime integration/tests, `PROGRESS.md`, phase index.
- Dependencies: Progress/logging and chunk renderer contracts.

## Acceptance Criteria
```powershell
python scripts\validate_workspace.py
.\venv\python.exe -m pytest tests
```

## Verification
1. Run the acceptance commands.
2. Confirm state files are written only under temp/runtime cache paths in tests.
3. Update `PROGRESS.md` and this phase index.

## Do Not
- Do not treat resume state as part of generated document output.
- Do not skip chunks after parser/version-relevant option changes.
- Do not create hidden global state.