Six milestones to a plugin API

Line and bar marks draw from a plain array of numbers. One canvas target, no interaction, no theming.

Linear, time, and ordinal scales, with tick labels chosen from the data range instead of hard-coded.

Hover, tooltip, and range selection, each reachable from the keyboard and announced to screen readers.

Semantic versioning begins. The mark, scale, and theme contracts are frozen for the whole 1.x line.

The same chart definition renders to static SVG without a browser, for documents and email digests.

Marks, scales, and themes can ship as separate packages, so the core stops growing with every new chart.