Function collect_php_files

src/util.rs:223–255

Recursively collect all `.php` files under a directory, respecting `.gitignore` rules and skipping hidden directories (`.git`, `.idea`, etc.). Uses the `ignore` crate's `WalkBuilder` for gitignore-aware traversal. This is consistent with the other workspace walkers (`scan_workspace_fallback_full`, `collect_php_files_gitignore`). Used by Go-to-implementation (Phase 5) which walks PSR-4 source di

(dir: &Path, vendor_dir_paths: &[PathBuf])

/// Silently skips directories and files that cannot be read (e.g.
/// permission errors, broken symlinks).
pub(crate) fn collect_php_files(dir: &Path, vendor_dir_paths: &[PathBuf]) -> Vec<PathBuf> {
    use ignore::WalkBuilder;

    let mut result = Vec::new();
    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") {
            result.push(path.to_path_buf());
        }
    }

    result
}

/// Recursively collect all `.php` files under a workspace root,
/// respecting `.gitignore` rules (including nested and global