v0.27.0

Added

• Node notes across five chart types. Flowchart, state, class, ER, and
  boxes-and-lines diagrams gain note <id> — a floating comment bubble tethered
  to a node, placed by a shared collision-aware layout (utils/notes/) that
  keeps notes clear of shapes and never moves the diagram's own geometry. Notes
  collapse to a small comment-bubble badge and expand on click; colour a note
  with a trailing colour word (note A This is a warning red). no-notes opts
  out. Org and sitemap were evaluated and excluded — their indentation grammar
  conflicts with the note syntax.
• Map: region values on choropleths. Regions can carry their own numeric
  value, rendering a true choropleth alongside POIs. Tiny or POI-blocked
  regions get a leader-lined callout — placed in a reserved column on either
  edge, fanned out radially, or revealed by a zoom-out reserve — with chips kept
  off the canvas edge and high-contrast leaders.
• Map: IATA airport codes resolve as place identifiers. poi JFK,
  route JFK -> LAX and any three-letter IATA code resolve to airport
  coordinates through the existing name-lookup path — no new syntax. Coverage is
  large international hubs + all US scheduled-commercial airports, shipped as a
  separate optional airports.json asset (OurAirports, public domain; ~38 KB
  gz, loaded only for map diagrams). Resolution is case-insensitive and by
  code only; airports are the lowest-precedence identifier, so a token that is
  both a city and a code resolves to the city (with a non-blocking shadow
  hint). Editor completion lists codes as a labeled group below cities. Unknown
  codes emit E_MAP_UNKNOWN_AIRPORT_CODE with an as <CODE> hint.
• Map: tagged connector/leg colours. A trailing tag on a connector or route
  leg colours the line (A ~> B l: Cruise); focusing a leg co-highlights its
  endpoint POIs and the matching legend line, without dimming the basemap.
• Map: undirected + labeled-undirected connector tokens.
• Map: population-sized city dots as a subtle default layer (no-cities
  opts out), and footprint-scaled, faded orientation backdrop labels for
  context.
• Map: auto-zoom for compact US region maps — North-up framing with
  full-name labels; conic equal-area projection with a data-centered fit for
  regional maps.
• Metric: colour ramps anchor at the data minimum rather than zero, so
  value ranges that don't start at 0 use the full ramp.

Changed

• Default palette is now Slate (was Nord), part of the Epic 108 rebrand. The
  active palette is correctly threaded into named-colour resolution so themed
  colours track the selected palette everywhere.
• Sequence: participant position override requires a colon — position: N
  (was bare position N). Pre-1.0, this is a hard break with no compat shim.
• Region borders now stay legible on dark themes; value ramps and segment fills
  stay strictly on-palette (no invented hues); journey-map emotion faces align
  to the curve scale; the swimlane legend toggle has a larger hit area.

Removed

• Trimmed the palette registry to seven curated palettes. Dropped Dracula,
  Monokai, One Dark, Solarized, Gruvbox, and Rosé Pine — each failed the
  categorical-distinctness bar a diagram palette must meet (a single hex reused
  across distinct slots, or collapsed hues, so multi-category diagrams render
  different categories with identical colours). getPalette() falls back to the
  default (slate) for any removed id, so saved preferences and share URLs
  degrade gracefully. The kept seven: atlas, blueprint, catppuccin, nord, slate,
  tidewater, tokyo-night.

Performance

• World-map SVG shrunk ~75% (4.5 MB → 1.2 MB) via render-side coordinate
  rounding, screen-space vertex thinning, and <use>-deduplicated coastline
  water-lines — unblocking globe/world maps in static-site builds.

Internal

• Shared glyph-table text measurement now backs chart-type text sizing; extracted
  shared helpers for arrowhead <marker>s, fitDiagramToCanvas, and legend
  geometry; general dedup across renderers. No intended user-visible change.