Verification

Evidence in repository:

• Integration tests cover fixture-based round-trip behavior across supported document kinds.
• Unknown syntax preservation tested explicitly.
• kiutils-inspect JSON/text contract smoke tests present.

Test evidence snippet

#![allow(unused)]
fn main() {
fn pcb_fixture_roundtrip_lossless_and_unknown() {
    let src_path = fixture("sample.kicad_pcb");
    let src = fs::read_to_string(&src_path).expect("read fixture");

    let doc = PcbFile::read(&src_path).expect("parse");
    assert_eq!(doc.ast().unknown_nodes.len(), 1);

    let out = tmp_file("pcb", "kicad_pcb");
    doc.write(&out).expect("write");
    let got = fs::read_to_string(&out).expect("read out");
    assert_eq!(got, src);

    let _ = fs::remove_file(out);
}
}

Local gate

cargo fmt --all
cargo test
cargo clippy --all-targets --all-features -- -D warnings
mdbook build docs