v0.2.1

Fixed

• Install with stable Symfony: symfony/yaml ^8.1 is required, not the unreleased 8.2. A Mermaid participant configuration that is a block scalar alone reads the same on both.
• Graphviz: an edge whose port names a compass point (a:p:w -> b:q:w, a table cell's side) leaves and reaches its node by that side, round the node where it must, as dot routes it. A loop between two such ports is drawn out of that side, and the drawing grows to hold edges that run round a node.
• Graphviz: a shape=plain node is its label alone, without the margin or the least width and height other shapes keep, as dot sizes it.