PDFToMD/phases/5-markdown-rendering-assets/step0.md

Step 0: markdown-block-renderer

Read First

• /AGENTS.md
• /PLAN.md
• /PROGRESS.md
• /docs/HARNESS.md
• /docs/IMPLEMENTATION_PLAN.md
• /docs/ARCHITECTURE.md
• /docs/CONVERSION_POLICY.md
• /phases/4-semantic-enrichment/index.json

Task

Implement block-level Markdown rendering for headings, paragraphs, lists, blockquotes, formulas, captions, and simple references.

Renderer tests should use internal block fixtures, not live PDF parsing.

Sprint Contract

• Done means: core block types render to deterministic Markdown strings with focused tests.
• Hard thresholds: math delimiter validation is applied; renderer does not inject warnings/errors into Markdown; output is stable across runs.
• Files owned: src/pdftomd/renderer.py, tests, PROGRESS.md, phases/5-markdown-rendering-assets/index.json.
• Dependencies: Phase 4 enriched blocks and Phase 3 formula outputs.

Acceptance Criteria

python scripts\validate_workspace.py
.\venv\python.exe -m pytest tests

Verification

1. Run the acceptance commands.
2. Confirm renderer tests are focused, not full snapshots.
3. Update PROGRESS.md and this phase index.

Do Not

• Do not invoke Marker or Nougat.
• Do not implement table/asset file writing in this step.
• Do not add sidecar document outputs.