# Step 2: figure-asset-writer

## Read First
- /AGENTS.md
- /PLAN.md
- /PROGRESS.md
- /docs/HARNESS.md
- /docs/IMPLEMENTATION_PLAN.md
- /docs/ARCHITECTURE.md
- /docs/CONVERSION_POLICY.md
- /phases/1-core-runtime-contracts/step2.md
- /phases/5-markdown-rendering-assets/step0.md

## Task
Implement deterministic image/figure asset writing and Markdown image reference generation.

Use hash-based deduplication when asset bytes are available and preserve figure captions and reference anchors.

## Sprint Contract
- Done means: figure assets can be written to temp output bundles with deterministic names and Markdown references.
- Hard thresholds: duplicate images share stored assets where configured; Korean path output is tested; missing assets produce validation failures, not broken silent links.
- Files owned: `src/pdftomd/assets.py`, renderer integration/tests, `PROGRESS.md`, phase index.
- Dependencies: Output bundle contract and renderer.

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

## Verification
1. Run the acceptance commands.
2. Confirm tests write only to temporary directories.
3. Update `PROGRESS.md` and this phase index.

## Do Not
- Do not write into real `output/` during tests.
- Do not rename source PDFs.
- Do not drop figure captions.