GTR013 — Reorder <tool> children (codemod)

Contract: behaviour-preserving.

Claim

Reordering <tool>’s child elements into IUC order is a no-op.

Proof

1. <tool> is xs:all in every vendored XSD — order-free by schema.

2. Galaxy’s child access is tag-keyed (root.find("command"), findall(…)) across tool_util/parser/xml.py — never positional.