0.4.0

Start here

• dtg init writes a working definition, not just a config. It asks where
  the definition should live and what it starts as: a starter, a blank, or
  the Tailwind or Material example. --definition and --from answer for
  it.
• An unnamed CSS output is named after its definition: colors.dtg.yaml
  gives colors.generated.css. It was tokens.generated.css for everything.
• dtg dev is now dtg edit, and the browser is the editor.
• The README is a quick start. The argument for the model moved to
  Store colors as algorithms, not hexes.

Algorithms

• curve (experimental): a ramp through a picked color, shaped by
  lightness, chroma and hue curves you edit in the editor.
• tone (experimental): the selector is lightness itself, CIELAB L*, so
  contrast per tone holds across hues, as in Material 3.
• Color math runs in OKLab and in the widest space its inputs use, so a
  wide-gamut anchor is no longer clipped to sRGB on the way in. Some
  chromatic stops shift by one in a channel; plain CSS gains a
  @supports (display-p3) block for colors sRGB cannot show.

Grammar

• domain is now group, in the definition and in the editor's URLs.
• Edits through a YAML alias are refused, and the editor shows what an
  anchor is shared with.

Editor

• Resolution runs in the page. The dev server serves the working copy at
  /api/state; state.json replaces snapshot.json in dtg docs.
• dtg docs --editable lets visitors try edits in their own page.
• Embedded in an iframe, the editor posts its CSS as dtg:css on every
  change, and takes dtg:background from the host.
• The chrome is built on Mosaic's base stylesheet, with a narrow layout
  under 640px. No bundled fonts; the system stack.
• Each mode has a scheme, declared as scheme: light | dark or read from
  its colors, and a background to view it on: white or black by scheme, or
  a color or ref set on the Settings page and kept in
  editor.backgrounds. The sidebar's background chip lists one entry per
  distinct background.
• One value editor everywhere, with Picker, Palette, Systems and Roles
  sources as the surface allows. A change shows live and commits as one
  undo step when the panel closes. Escape cancels.
• The overview page is gone. / is the definition, which now carries the
  warnings; the sidebar's top links are Definition and Settings.

Package

• exports declares the API: resolveDefinition, emitCss, emitScss,
  emitDtcg and their types at the root, the CLI at ./cli. Deep imports
  of dist/ no longer resolve.
• The examples ship in the package, for init --from.