Function parse_yaml_report 

pub fn parse_yaml_report(input: &str) -> YamlParseReport

Parse prototype YAML tree structure and include diagnostics on failure.

Diagnostics flow through the v2-aware [super::validator::validate_yaml] pass, which composes per-cluster check_* functions covering directive ordering, structural shape (unterminated flow, trailing content, invalid keys, indent anomalies, block-scalar header, etc.), and lex-level checks like LEX_INVALID_DOUBLE_QUOTED_ESCAPE.

The returned tree, when present, comes from the v2 scanner+builder.