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phases/5-markdown-rendering-assets/index.json

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+{
+  "project": "PDFtoMD",
+  "phase": "5-markdown-rendering-assets",
+  "steps": [
+    {
+      "step": 0,
+      "name": "markdown-block-renderer",
+      "status": "pending"
+    },
+    {
+      "step": 1,
+      "name": "table-renderer-fallbacks",
+      "status": "pending"
+    },
+    {
+      "step": 2,
+      "name": "figure-asset-writer",
+      "status": "pending"
+    },
+    {
+      "step": 3,
+      "name": "chunk-renderer",
+      "status": "pending"
+    }
+  ]
+}

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

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+# 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
+```powershell
+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.

phases/5-markdown-rendering-assets/step1.md

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+# Step 1: table-renderer-fallbacks
+
+## Read First
+- /AGENTS.md
+- /PLAN.md
+- /PROGRESS.md
+- /docs/HARNESS.md
+- /docs/IMPLEMENTATION_PLAN.md
+- /docs/CONVERSION_POLICY.md
+- /phases/5-markdown-rendering-assets/step0.md
+
+## Task
+Implement table rendering policy for Markdown tables, limited HTML tables, and image fallback links.
+
+Use structured table objects and avoid ad hoc string parsing for complex cases where possible.
+
+## Sprint Contract
+- Done means: simple tables render as Markdown, complex tables can render as limited HTML or fallback references, and table captions/footnotes are preserved.
+- Hard thresholds: tests cover merged-cell-like structures, footnotes, captions, and table fallback decisions; invalid table output is detected by quality gates.
+- Files owned: `src/pdftomd/renderer.py`, table models/tests, `PROGRESS.md`, phase index.
+- Dependencies: Step 0 renderer and Phase 0 quality gates.
+
+## Acceptance Criteria
+```powershell
+python scripts\validate_workspace.py
+.\venv\python.exe -m pytest tests
+```
+
+## Verification
+1. Run the acceptance commands.
+2. Confirm fallback images are linked but not generated unless a table asset exists.
+3. Update `PROGRESS.md` and this phase index.
+
+## Do Not
+- Do not fake table content that was not extracted.
+- Do not discard captions or footnotes.
+- Do not implement full HTML sanitizer scope beyond limited table output.

phases/5-markdown-rendering-assets/step2.md

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+# Step 2: figure-asset-writer
+
+## Read First
+- /AGENTS.md
+- /PLAN.md
+- /PROGRESS.md
+- /docs/HARNESS.md
+- /docs/IMPLEMENTATION_PLAN.md
+- /docs/ARCHITECTURE.md
+- /docs/CONVERSION_POLICY.md
+- /phases/1-core-runtime-contracts/step2.md
+- /phases/5-markdown-rendering-assets/step0.md
+
+## Task
+Implement deterministic image/figure asset writing and Markdown image reference generation.
+
+Use hash-based deduplication when asset bytes are available and preserve figure captions and reference anchors.
+
+## Sprint Contract
+- Done means: figure assets can be written to temp output bundles with deterministic names and Markdown references.
+- Hard thresholds: duplicate images share stored assets where configured; Korean path output is tested; missing assets produce validation failures, not broken silent links.
+- Files owned: `src/pdftomd/assets.py`, renderer integration/tests, `PROGRESS.md`, phase index.
+- Dependencies: Output bundle contract and renderer.
+
+## Acceptance Criteria
+```powershell
+python scripts\validate_workspace.py
+.\venv\python.exe -m pytest tests
+```
+
+## Verification
+1. Run the acceptance commands.
+2. Confirm tests write only to temporary directories.
+3. Update `PROGRESS.md` and this phase index.
+
+## Do Not
+- Do not write into real `output/` during tests.
+- Do not rename source PDFs.
+- Do not drop figure captions.

phases/5-markdown-rendering-assets/step3.md

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+# Step 3: chunk-renderer
+
+## Read First
+- /AGENTS.md
+- /PLAN.md
+- /PROGRESS.md
+- /docs/HARNESS.md
+- /docs/IMPLEMENTATION_PLAN.md
+- /docs/ARCHITECTURE.md
+- /docs/CONVERSION_POLICY.md
+- /phases/1-core-runtime-contracts/step2.md
+- /phases/5-markdown-rendering-assets/step2.md
+
+## Task
+Implement chunk planning and chunk Markdown bundle writing over enriched blocks.
+
+Chunk boundaries should target 20 pages but preserve logical block integrity for paragraphs, tables, figures, and formulas.
+
+## Sprint Contract
+- Done means: chunk files with frontmatter can be written deterministically from internal document fixtures.
+- Hard thresholds: block integrity is preserved at chunk boundaries; chunk frontmatter includes minimum context; quality gates run on rendered chunks.
+- Files owned: `src/pdftomd/chunking.py`, `src/pdftomd/renderer.py`, tests, `PROGRESS.md`, phase index.
+- Dependencies: Renderer, assets, and output bundle contracts.
+
+## Acceptance Criteria
+```powershell
+python scripts\validate_workspace.py
+.\venv\python.exe -m pytest tests
+```
+
+## Verification
+1. Run the acceptance commands.
+2. Confirm long-document chunk fixtures cover boundary behavior.
+3. Update `PROGRESS.md` and this phase index.
+
+## Do Not
+- Do not split blocks in the middle to satisfy exact 20-page counts.
+- Do not create document sidecar metadata files.
+- Do not implement CLI orchestration here.