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Spec for the next big arc: replacing the current chart-placeholder behaviour (single image layer at PPTX_IMAGE_PLACEHOLDER_URL) with native rendering — bars / wedges / lines as Artstr shape layers, labels as text layers. Branch pptx-chart-spec. Scope decisions baked in: - Phase 1: clustered column + bar charts only. Bars as rect shape layers, category labels as text. Plot area derived via a fixed inset on the chart's graphicFrame bounding box (no c:manualLayout reading until Phase 4). - Phase 2: pie / doughnut. Slice geometry emitted as kind:'path' with SVG arc d-attributes. - Phase 3: line charts with optional markers. - Phase 4: title / legend / data labels / value-axis ticks / gridlines. - Phase 5: stacked + percent-stacked variants. - Deferred to placeholder: scatter, bubble, area, radar, 3D, combo charts, trendlines, error bars, per-point overrides. Architecture: - New src/pptx-importer-charts.js with the per-type builders, loaded as an addendum to pptx-importer.js (or inlined — TBD during implementation; the dependency budget is small enough that a single file might be cleaner). - convertGraphicFrame in pptx-importer.js gets a "try native before placeholder" branch: parse chart XML, dispatch on type, fall through to the existing placeholder + warning when the builder returns null. - All chart data read from c:strCache / c:numCache. The embedded ppt/embeddings/*.xlsx workbook is ignored — caches are reliable in OOXML output and reading XLSX is its own rabbit hole. Acceptance criteria for Phase 1: gallery_template_layout_set.pptx slide 10 imports with 8 native bar layers (#5E735D + #B05A44 clustered across Q1-Q4) plus 4 category-label text layers, matching what PowerPoint shows. Scatter / 3D / etc. still placeholder cleanly without crash.