marp-to-editable-pptx

System skill for the marp-to-editable-pptx VS Code extension. Covers the full architecture (extension → marpCli → Puppeteer → dom-walker → slide-builder → PptxGenJS), the visual fidelity improvement loop (gen-pptx + compare-visuals + PowerPoint COM), known open bugs (code block fontSize/indentation, auto-scaling detection), fixture safety rules, ADR recording, and critical failure patterns that have caused false "fixed" claims. Use when: modifying dom-walker.ts or slide-builder.ts, diagnosing PPTX rendering issues, running compare-visuals, adding test fixtures, fixing code block bugs, reviewing PRs, or onboarding to this codebase. Trigger words: "PPTX output", "slide layout", "text missing", "compare-visuals", "visual diff", "code block", "font size", "indentation", "auto-scaling", "marp", "pptx", "dom-walker", "slide-builder", "fixture", "ADR".