Function apply_pattern_inheritance 

pub fn apply_pattern_inheritance(
    entry: &IndexEntry,
    catalogue: &Catalogue,
) -> (IndexEntry, Option<InheritanceWarning>)

Apply pattern-id inheritance to entry and return the resolved entry plus any advisory warning.

The function clones entry so the caller’s view is unchanged. Cloning is cheap (the entry is a handful of Option<String> / small primitive fields) and the alternative — mutating in place — would force every caller to express the lifetime of the catalogue borrow, which is more friction than it’s worth here.