add pdftomd

.codex/skills/math-markdown-review/references/obsidian-output-checks.md

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+# Obsidian Output Checks
+
+Use these checks when designing or reviewing Markdown output.
+
+## Math
+
+- Inline math: `$...$`, no line breaks inside the delimiter pair.
+- Display math: `$$...$$`, with blank lines before and after the block.
+- Preserve source provenance for formulas: page index, bbox if available, engine, confidence, and warning codes.
+- Record render failures separately from extraction confidence.
+- Avoid rewriting LaTeX semantics unless the rule is deterministic and tested.
+
+## Assets
+
+- Store images under a deterministic asset directory next to the Markdown output.
+- Use relative Markdown links that remain valid when the output directory is moved as a unit.
+- Record asset source page, bbox if available, generated file path, and missing-link warnings.
+
+## Tables
+
+- Prefer Markdown tables only when cell boundaries and reading order are reliable.
+- If formulas or merged cells make Markdown tables misleading, use a readable fallback and emit a table warning.
+- Keep table warnings visible in both JSON metadata and `.report.md`.
+
+## Report Signals
+
+- Total pages processed and pages with warnings.
+- Math block count, inline math count, and non-renderable math count.
+- Broken asset links and missing assets.
+- Table degradation count.
+- Reading-order uncertainty count.