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phases/1-core-runtime-contracts/step1.md

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+# Step 1: conversion-options-config
+
+## Read First
+- /AGENTS.md
+- /PLAN.md
+- /PROGRESS.md
+- /docs/HARNESS.md
+- /docs/IMPLEMENTATION_PLAN.md
+- /docs/ARCHITECTURE.md
+- /docs/ADR.md
+- /phases/1-core-runtime-contracts/step0.md
+
+## Task
+Define the typed conversion options and runtime configuration used by CLI, library, parser adapters, renderer, and UI.
+
+Include runtime mode, device behavior, chunk target pages, formula parser mode, Nougat command path, output directory, model cache location, and resume/log options.
+
+## Sprint Contract
+- Done means: conversion options have defaults matching project policy and can be constructed by tests without CLI parsing.
+- Hard thresholds: explicit `cuda` fail-fast semantics and `auto` fallback semantics are represented; Nougat remains formula-only; PyQt and hosted API options are not introduced.
+- Files owned: `src/pdftomd/`, `tests/`, `PROGRESS.md`, `phases/1-core-runtime-contracts/index.json`.
+- Dependencies: Step 0 normalized path/slug contract.
+
+## Acceptance Criteria
+```powershell
+python scripts\validate_workspace.py
+.\venv\python.exe -m pytest tests
+```
+
+## Verification
+1. Run the acceptance commands.
+2. Confirm defaults align with `docs/ARCHITECTURE.md` and `docs/CONVERSION_POLICY.md`.
+3. Update `PROGRESS.md` and this phase index.
+
+## Do Not
+- Do not add command-line parsing yet.
+- Do not initialize CUDA, Marker, or Nougat.
+- Do not add external API settings.