add files

phases/6-cli-runtime-resume/step2.md

@@ -0,0 +1,37 @@
+# Step 2: resume-state
+
+## Read First
+- /AGENTS.md
+- /PLAN.md
+- /PROGRESS.md
+- /docs/HARNESS.md
+- /docs/IMPLEMENTATION_PLAN.md
+- /docs/CONVERSION_POLICY.md
+- /phases/6-cli-runtime-resume/step1.md
+
+## Task
+Implement runtime resume state for successful and failed chunks.
+
+Resume state is a runtime artifact, not a document output sidecar.
+
+## Sprint Contract
+- Done means: conversion can skip completed chunks and retry failed chunks using a local state file in tests.
+- Hard thresholds: state format is deterministic; stale state is detected; resume does not skip chunks when input/options changed materially.
+- Files owned: `src/pdftomd/resume.py`, runtime integration/tests, `PROGRESS.md`, phase index.
+- Dependencies: Progress/logging and chunk renderer contracts.
+
+## Acceptance Criteria
+```powershell
+python scripts\validate_workspace.py
+.\venv\python.exe -m pytest tests
+```
+
+## Verification
+1. Run the acceptance commands.
+2. Confirm state files are written only under temp/runtime cache paths in tests.
+3. Update `PROGRESS.md` and this phase index.
+
+## Do Not
+- Do not treat resume state as part of generated document output.
+- Do not skip chunks after parser/version-relevant option changes.
+- Do not create hidden global state.