- Implement Scopes<S> with eager parse, scope reduction, and index computation - Add scope reconstruction from buffer indices (unsafe, invariant-guarded) - Add BorrowOrShare accessors (iter, get, get_owned, get_as) - Add conversion methods (borrow, convert, into_static, to_normalized_string) - Add Serialize/Deserialize with sorted normalised output - Add convenience methods (len, is_empty, as_str, empty, Default, grants) - Use fluent-uri EStr for percent-decoding in include scope parsing