Function render_annotated_yaml 

pub fn render_annotated_yaml(
    node: &AnnotatedNode,
    source_labels: &[String],
) -> String

Emit an AnnotatedNode as YAML with a trailing # <label> on each leaf line, column-aligned for legibility.

source_labels[i] is the label shown for layer index i (typically a filename). Sequences are rendered inline when all items are scalars and the resulting line fits the INLINE_SEQ_LIMIT threshold; otherwise they drop to block style with the source tag on the key line.