# Step 2: marker-block-normalization

## Read First
- /AGENTS.md
- /PLAN.md
- /PROGRESS.md
- /docs/HARNESS.md
- /docs/IMPLEMENTATION_PLAN.md
- /docs/ARCHITECTURE.md
- /docs/CONVERSION_POLICY.md
- /phases/0-harness-foundation/step1.md
- /phases/2-marker-adapter/step0.md

## Task
Map Marker structured output into the internal block model for headings, paragraphs, lists, tables, figures, captions, and equation candidates.

Prefer structured Marker APIs or JSON-like structures over scraping final Markdown.

## Sprint Contract
- Done means: fake Marker structures and at least one real or recorded sample shape map into internal block types.
- Hard thresholds: semantic block roles are preserved; bounding boxes and page numbers survive where available; formula blocks are only marked as candidates for Phase 3.
- Files owned: `src/pdftomd/marker_adapter.py`, model additions if required, tests, `PROGRESS.md`, phase index.
- Dependencies: Phase 0 models and Step 0 adapter.

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

## Verification
1. Run the acceptance commands.
2. Confirm no final Markdown scraping is required for normal block mapping.
3. Update `PROGRESS.md` and this phase index.

## Do Not
- Do not perform Nougat conversion.
- Do not render Markdown.
- Do not discard page or bounding-box metadata without a documented reason.