v0.20.0

Added: map chart type

DGMO now renders geographic maps. Plot points of interest, shade
regions, and draw weighted routes/links over a world or US base map.

• Base maps: equirectangular world (snapped to a full Greenwich
  frame, every continent in view) and a purpose-built US projection
  (Albers conic with custom Alaska/Hawaii insets). Land fills the
  canvas; oceans render blue, lakes blue, neighbouring land neutral.
• Points of interest with inline labels that flip left when they
  would run off-canvas; dense clusters break into callout columns.
• Regions shaded by a selectable colouring dimension — score
  (continuous ramp) or tag (categorical) — with a bivariate flip
  between the two.
• Routes/links drawn as weighted arrows between points.
• Legend with hover highlighting and a score-gradient scrubber;
  hovering dims non-matching regions to neutral land.
• Natural Earth 110m rivers overlaid on world maps; crisp 10m North
  America surroundings under the US view.
• mapNeutralLandColor exported for hosts that dim the base map.

⚠ BREAKING: description/technology keywords now required (C4 + infra)

Keywordless-prose promotion is gone. In C4 and infrastructure
diagrams, a bare line under a node is no longer silently promoted to
its description — you must use the description (and technology)
keyword explicitly. The deprecation message has been corrected to
point at the keyword form. (DD-1, DD-2)

# Before (0.19.x) — bare prose promoted to description
Service API
  Handles all the things

# After (0.20.0)
Service API
  description: Handles all the things

Fixed

• Map: blue ocean on world maps (dropped antimeridian frame-fillers);
  region-label halos use the opposite colour of the text so they
  always read; clean red score ramp with no muddy brown over green
  land; POI markers default to orange rather than the blue accent.