Function collect_php_files

src/classmap_scanner.rs:1759–1796

Collect all `.php` file paths under a directory using gitignore-aware walking. Paths are appended to `out`. No file content is read. Uses the `ignore` crate's `WalkBuilder` to respect `.gitignore` rules at every level. Hidden directories are skipped automatically. Directories whose absolute path is in `vendor_dir_paths` are also skipped. Individual files whose path appears in `skip_paths` are

(
    dir: &Path,
    vendor_dir_paths: &[PathBuf],
    skip_paths: &HashSet<PathBuf>,
    out: &mut Vec<PathBuf>,
)

/// skipped.  Individual files whose path appears in `skip_paths` are
/// excluded (used by the merged classmap + self-scan pipeline).
fn collect_php_files(
    dir: &Path,
    vendor_dir_paths: &[PathBuf],
    skip_paths: &HashSet<PathBuf>,
    out: &mut Vec<PathBuf>,
) {
    use ignore::WalkBuilder;

    let vendor_paths: Vec<PathBuf> = vendor_dir_paths.to_vec();

    let walker = WalkBuilder::new(dir)
        .git_ignore(true)
        .git_global(true)
        .git_exclude(true)
        .hidden(true)
        .parents(true)
        .ignore(true)
        .filter_entry(move |entry| {
            if entry.file_type().is_some_and(|ft| ft.is_dir()) {
                let path = entry.path();
                if vendor_paths.iter().any(|vp| vp == path) {
                    return false;
                }
            }
            true
        })
        .build();

    for entry in walker.flatten() {
        let path = entry.path();
        if path.is_file() && path.extension().is_some_and(|ext| ext == "php") {
            let owned = path.to_path_buf();
            if !skip_paths.contains(&owned) {
                out.push(owned);
            }
        }
    }
}

/// Collect all `.php` file paths under a PSR-4 directory, computing the
/// expected FQN for each file from its relative path.  Paths and