v3.1.0

Native chart fidelity

• Export native chart chrome metadata (titles, overlays, axis labels) and mirror SVG fallback styling into native charts
• Inherit typography from the SVG fallback; preserve explicit bounds, point colors, and overlays
• Guard chart chrome against invisible fallback text

Checker / export validation hardening

• viewBox is now the single source of truth for canvas size (preview + export aligned)
• Error on silent-loss paint colors (hsl, alpha-hex); validate exported PPTX typefaces; harden spec_lock drift scanning

Internals

• Split native_objects into a subpackage; group drawingml/package modules; centralize SVG resource path resolution; parse each SVG once across DOM checks

Docs

• Require human review for AI-assisted PRs; sharpen image strategy & preview checkpoints