Function phase_consumes_aliases 

pub fn phase_consumes_aliases(
    groups: &BTreeMap<String, Vec<usize>>,
    kinds: &BTreeMap<String, UnitKind>,
    parsed: &[ParsedFile],
    unit_tables: &HashMap<String, UnitTable>,
    errors: &mut ErrorSink,
) -> HashMap<String, HashMap<String, String>>

Phases 5b’/5b’‘: collect each context’s consumes aliases (alias → consumed-context name), reporting alias-vs-alias conflicts (5b’), then report any alias that clashes with a locally-declared type/fn/capability/service/agent (5b’’). Returns the per-context alias maps; diagnostics go into errors.