Function per_edge_description_str 

pub fn per_edge_description_str(p: PerEdgeDescription) -> &'static str

Render a PerEdgeDescription to its wire literal — bit-identical to what the schema YAML accepts so consumers can echo the value back without case fiddling. forbidden (the default) is emitted explicitly rather than omitted so a schema without an explicit declaration still surfaces the resolved posture on the wire.