facet-rs / facet / 19871853185

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Preserve KDL parse error diagnostics in facet-kdl

When the kdl crate fails to parse a document, it provides rich diagnostic
information (line numbers, spans, labels). Previously, facet-kdl wrapped
the error but lost all this information - users only saw 'Failed to parse
KDL document'.

This change modifies the miette::Diagnostic impl for KdlError to delegate
to the inner kdl::KdlError for parse errors:
- source_code() now returns the source from the inner error
- related() exposes the sub-diagnostics from kdl::KdlError

Also adds:
- Test verifying parse error diagnostics are preserved
- Two syntax error scenarios in the KDL showcase

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