v0.1.0

First release. Extracts the generic, data-driven map adapter from sigwx-draw
(the v2 design) into a standalone package shared by every @softwarity drawing lib.

• Generic MapAdapter interface — zero domain types; driven by a declarative
  LayerSpec[] manifest and a fixed feature render-prop contract.
• Three engine adapters: MapLibre GL, OpenLayers, Leaflet (new),
  rendering identically from the same baked feature props.
• Shared utilities: sprite atlas (colorizeSprite/svgToDataUrl/loadSpriteImage),
  toolbar (populateToolbar/applyToolbarLayout), tooltip (applyTooltipStyle),
  prop coercions (rgba/num/str/deg2rad/wrapLabel), cursorForHit.
• FakeAdapter (./testing) for unit-testing controllers without a map.
• Sub-path exports (., ./maplibre, ./openlayers, ./leaflet, ./testing)
  with optional peer deps, so a consumer only pulls the engine(s) it uses.
• Carefully ported fixes: OpenLayers DragPan capture-phase guard + top-of-stack
  hit-testing; MapLibre lazy sprite/data: icon materialization + full teardown;
  homogeneous clockwise-degree icon rotation across all three engines.