pub fn child_path(parent: &str, segment: &str) -> Result<String, AppError>Expand description
Build a child path under parent by appending a single segment. The
segment must be one valid identifier — it cannot itself contain a separator
(else it would silently add several levels) — and the resulting path must
validate (depth included).
Thin wrapper over vta_sdk::context_path::child_path mapping the SDK error
onto AppError::Validation (message preserved verbatim).