card-skill v0.3.0 - measured formula cards

Highlights

• Redesigned article-diagram around a single Editorial Equation formula-card grammar.
• Added real-font measurement, semantic line grouping, adaptive body-2-1 / body-3-2 selection, and readable density limits.
• Added stable semantic output markers and stricter checks for formula-card balance, overflow, and missing metrics.
• Kept concept-map, process-flow, and boundary-model inputs as legacy-compatible paths.
• Refreshed the README gallery with separate portrait and landscape rows and a new formula-card example.

Reliability

• Rejects mixed legacy/compression payloads instead of silently choosing a renderer.
• Fixes measurement viewport parsing and ensures measured layout is selected before fallback aspect estimation.
• Expands validation for short, dense, mixed-language, arrow, structure-only, and missing-marker cases.

Verification

• npm test
• npm run smoke
• npm pack --dry-run --json
• GitHub CI on Node.js 22 and 24