# Step 0: cli-entrypoint-options

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

## Task
Implement the `python -m pdftomd` CLI entrypoint and option parsing over the existing library API.

Expose input PDF, output directory, formula parser mode, Nougat command, runtime/device, chunk size, logging, and resume options.

## Sprint Contract
- Done means: CLI options map into typed conversion options and can run against a mocked pipeline in tests.
- Hard thresholds: CLI does not duplicate conversion logic; defaults match docs; explicit `cuda` and `auto` modes are represented.
- Files owned: `src/pdftomd/__main__.py`, CLI modules/tests, `README.md` if command docs change, `PROGRESS.md`, phase index.
- Dependencies: Core contracts and renderer pipeline.

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

## Verification
1. Run the acceptance commands.
2. Confirm CLI help text shows documented options.
3. Update `PROGRESS.md` and this phase index.

## Do Not
- Do not put parser logic inside CLI parsing code.
- Do not implement PyQt UI.
- Do not silently CPU fallback for explicit CUDA mode.