chartlet 0.1.0

The first release without the alpha tag. The specification keeps schemaVersion: 1; every
specification that rendered with 0.1.0-alpha.7 still renders, with the changes in output listed
under Changed.

Added

• Bar charts: stack: "normal" (by value, with the total beyond each stack) and stack: "percent"
  (shares of each category's total); patterns: true draws every other series as an outline;
  references draws reference lines such as an average or a target.
• Line charts take categories and series; each series has its own color and line pattern.
• Value axis: min and max, thousandsSeparator, scale: "log" and reverse.
• Time charts: timeAxis.kind: "number" for profiles and deep time, timeAxis.reverse,
  curve: "step", legend: "end" (names at the end of the lines), sparkline: true, zones with
  a single edge, and layer colors as var(--name, #hex) whose fallback the print variant draws.
• Small multiples: independentAxes gives every panel its own value axis; mobile.columns.
• Stripes: stretch: true draws a band of color that takes any box.
• Variants: --variant print (literal colors for PDF and print renderers) and --variant social
  (1200 × 630 for Open Graph images).
• PNG output behind the optional cargo feature png, with Inter bundled (OFL-1.1).
• styles: "external" with the shared stylesheet @casoon/chartlet/chartlet.css
  (chartlet stylesheet [--types …]), so a page with many charts loads their CSS once.
• alternative: true and chartlet::text_alternative: the description and the data table as data.
• allowWarnings / --allow-warning: strict mode lets reviewed warning codes through.
• hooks: true and the optional module @casoon/chartlet/interactive: crosshair with values,
  series toggles, scroll stations and playback, reading only the static output.
• The HTML figure carries data-viz="chart" and marks its data table as the text layer.
• @casoon/chartlet-mcp: tools named chartlet_*, CHARTLET_MCP_ROOT confining outputPath,
  and a view that shows the chart in the chat of hosts that support MCP Apps.

Changed

• A line, time series or range bar whose values are all zero or more gets no margin below zero.
• One tooltip rule for lines and candles: a tooltip for every observation while observations
  stand at least 4 pixels apart, on an invisible target where no marker is drawn.
• Candle colors differ in lightness as well as in hue.
• German output writes dates as 31.08.2026; a range bar chart is a „Spannweitendiagramm“, a
  realm of a knowledge landscape a „Bereich“.
• Print and social variants write font-weight: 600, which renderers outside the browser read.
• Topic maps and knowledge landscapes are marked experimental.
• The npm package renders with its bundled WebAssembly build; a CLI is used only with binary
  or CHARTLET_BIN.